RE: VPN PPTP problem

Hello David,

Thank you for posting here. I'm glad to see you here.

According to your description, I understand that you unable establish VPN
connection from external to SBS. If I have misunderstood the problem,
please don't hesitate to let me know.

Based on my research, I suggest we try the following steps to see if we can
resolve this issue:

1. You get error 800 on remote client, This issue may be caused by a router
that has outdated firmware. For example, this issue may occur if you are
using a Cisco router with firmware that is dated 2000 or earlier. To
resolve this issue, contact the manufacturer of the router for possible
upgrades. Please contact your Firebox support to confirm it.

2. Do you install ISA server 2004 sp3? If no, please try to install it and
see if it help:

Microsoft? Internet Security and Acceleration (ISA) Server 2004 Standard
Edition Service Pack 3
http://www.microsoft.com/downloads/details.aspx?FamilyId=A05A074A-5033-4792-
AF8B-58B90D841436&displaylang=en

3. Do you install Windows server 2003 sp2 on SBS? If yes, please perform
the following steps:

1) Update the network adapter drivers
Contact the network adapter manufacturer or contact the original equipment
manager (OEM) for the computer to determine whether an updated network
adapter driver is available. You must have drivers that are compatible with
NDIS 5.2 or with a later version.

2) Modify the registry to disable Receive Side Scaling
a. Click Start, click Run, type regedit , and then click OK.
b. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
c. If the EnableRSS registry entry does not exist, create it. To do this,
follow these steps:
a) On the Edit menu, point to New, and then click DWORD Value.
b) In the New Value #1 box, type EnableRSS , and then press ENTER.

d. Right-click EnableRSS, and then click Modify.
e. In the Value data box, type 0 (zero), and then click OK.
f. Exit Registry Editor.

3) Disable offloading support
a. Click Start, click Run, type regedit , and then click OK.
b. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
c. In the details pane, right-click EnableTCPA, and then click Modify.

Note: If the EnableTCPA registry entry does not exist, create it. To do
this, follow these steps:
a) On the Edit menu, point to New, and then click DWORD Value.
b) In the New Value #1 box, type EnableTCPA , and then press ENTER.

d. In the Value data box, type 0 (zero), and then click OK.
e. Exit Registry Editor.
f. Restart the computer.

If we cannot resolve the issue after we perform the above steps, please
help me collect some information for further investigation:

1. Run command "ipconfig /all > c:\ipconfig_sbs.txt" and "route print >
c:\route_sbs.txt" on SBS, send the files c:\ipconfig_sbs.txt and
c:\route_sbs.txt to me at v-terliu@xxxxxxxxxxxxx

2. Run command "ipconfig /all > c:\ipconfig_client.txt" and "route print >
c:\route_client.txt" on problematic client, send the files
c:\ipconfig_client.txt and c:\route_client.txt to me at
v-terliu@xxxxxxxxxxxxx

3. Please try the VPN connection from another remote client who connect
from another ISP. Does the issue reoccur?

4. Please capture screenshots on the client error messages and send the
pictures to me at v-terliu@xxxxxxxxxxxxx

5. Please help to gather the ISA Info:

1) Download the file from the following URL:

http://www.isatools.org/tools/isainfo.zip

2) Extract all files to a folder on ISA server.

3) Double click Isainfo.js. This will generate 2 files
ISAInfo2004-<computer-name>.log and ISAInfo2004-<computer-name>.xml in the
current folder.

4) Please send these files to me at v-terliu@xxxxxxxxxxxxx

6. Please also help to gather the ISA logs:

1) Schedule a down time.

2) Open ISA 2004 management console.

3) Expand the server node and highlight 'Monitoring'.

4) In the right pane, switch to the 'Logging' tab, make sure the 'Task
Pane' is showed there.

5) In the 'Task Pane', click 'Configure Firewall Logging' under 'Logging
Tasks', and then switch the 'log storage format' from 'MSDE database'
(default) to 'File'.

6) Switch to the 'Fields' tab, click 'Select All', and then click OK.

7) In the 'Task Pane', click 'Configure Web Proxy Logging' under 'Logging
Tasks', and then switch the 'log storage format' from 'MSDE database'
(default) to 'File'.

8) Switch to the 'Fields' tab, click 'Select All', and then click OK.

9) Click 'Apply' to save changes and update the configuration.

10) Temporarily disable the Firewall service. To do that, please click
Monitoring | Services tab, and then right click 'Microsoft Firewall' to
choose 'Stop'.

11) Clear the current existing W3C logs. To do that, go to the log saving
directory and clean any existing .W3C logs. By default, the logs will be
saved to 'C:\Program Files\Microsoft ISA Server\ISALogs'. (Some MDF may not
be able to deleted, that's normal.) You may backup them first and then
delete them.

12) Go back to the ISA 2004 management console, and then Start the stopped
'Microsoft Firewall' service.

13) Reproduce the problem, stop the service, and then gather the resulting
W3C files to me for analysis.

14) Please also let me know the IP address of the testing clients so that I
can filter the data.

I hope these steps will give you some help.

Thanks and have a nice day!

Best regards,

Terence Liu(MSFT)

Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security

=====================================================
This newsgroup only focuses on SBS technical issues. If you have issues
regarding other Microsoft products, you'd better post in the corresponding
newsgroups so that they can be resolved in an efficient and timely manner.
You can locate the newsgroup here:
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When opening a new thread via the web interface, we recommend you check the
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any updates in your thread. When responding to posts via your newsreader,
please "Reply to Group" so that others may learn and benefit from your
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Microsoft engineers can only focus on one issue per thread. Although we
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--------------------
| From: david.monticelli@xxxxxxxxx
| Newsgroups: microsoft.public.windows.server.sbs
| Subject: VPN PPTP problem
| Followup-To: microsoft.public.windows.server.sbs
| Date: Tue, 13 Nov 2007 05:40:10 -0800
| Organization: http://groups.google.com
| Lines: 907
| Message-ID: <1194961210.555733.130510@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
| NNTP-Posting-Host: 81.83.0.31
| Mime-Version: 1.0
| Content-Type: text/plain; charset="iso-8859-1"
| X-Trace: posting.google.com 1194961210 26568 127.0.0.1 (13 Nov 2007
13:40:10 GMT)
| X-Complaints-To: groups-abuse@xxxxxxxxxx
| NNTP-Posting-Date: Tue, 13 Nov 2007 13:40:10 +0000 (UTC)
| User-Agent: G2/1.0
| X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr;
rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9,gzip(gfe),gzip(gfe)
| Complaints-To: groups-abuse@xxxxxxxxxx
| Injection-Info: o80g2000hse.googlegroups.com; posting-host=81.83.0.31;
| posting-account=ps2QrAMAAAA6_jCuRt2JEIpn5Otqf_w0
| Bytes: 32870
| Path:
TK2MSFTNGHUB02.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTFEEDS02.phx.gbl!newsfeed0
0.sul.t-online.de!t-online.de!border2.nntp.dca.giganews.com!nntp.giganews.co
m!out01b.usenetserver.com!news.usenetserver.com!in02.usenetserver.com!news.u
senetserver.com!postnews.google.com!o80g2000hse.googlegroups.com!not-for-mai
l
| Xref: TK2MSFTNGHUB02.phx.gbl microsoft.public.windows.server.sbs:75597
| X-Tomcat-NG: microsoft.public.windows.server.sbs
|
| Hello terrence,
|
| Like you suggested, i have created a new post for my problem.
|
| Here is a quick review of my problem:
|
| - we are conencted to internet from a cable modem
| - the modem is connected to a hardware router/firewall (Watchguard
| Firebox)
| - the firebox is connected to the external nic of our server
| - the internal nic of our server is connected to our LAN Switch.
|
| Our server is SBS2003.
|
| For testing, with a computer connected to the LAN switch i can
| establish a VPN connection;
|
| and here are the packets captured on internal server nic:
|
| No. Time Source Destination
| Protocol Info
| 1 0.000000 192.168.2.128 192.168.2.5
| PPTP Set-Link-Info
|
| Frame 1 (78 bytes on wire, 78 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 64
| Identification: 0xfdd9 (64985)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x7708 [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1619 (1619), Dst Port: pptp
| (1723), Seq: 0, Ack: 0, Len: 24
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 2 0.000974 192.168.2.5 192.168.2.128
| PPTP Set-Link-Info
|
| Frame 2 (78 bytes on wire, 78 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 64
| Identification: 0x0e91 (3729)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa651 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1619
| (1619), Seq: 0, Ack: 24, Len: 24
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 3 0.074421 192.168.2.128 192.168.2.5
| PPTP Call-Clear-Request
|
| Frame 3 (70 bytes on wire, 70 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 56
| Identification: 0xfded (65005)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x76fc [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1619 (1619), Dst Port: pptp
| (1723), Seq: 24, Ack: 24, Len: 16
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 4 0.074589 192.168.2.5 192.168.2.128
| PPTP Call-Disconnect-Notify
|
| Frame 4 (202 bytes on wire, 202 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 188
| Identification: 0x0e99 (3737)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa5cd [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1619
| (1619), Seq: 24, Ack: 40, Len: 148
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 5 0.076188 192.168.2.128 192.168.2.5
| PPTP Stop-Control-Connection-Request
|
| Frame 5 (70 bytes on wire, 70 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 56
| Identification: 0xfdee (65006)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x76fb [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1619 (1619), Dst Port: pptp
| (1723), Seq: 40, Ack: 172, Len: 16
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 6 0.076469 192.168.2.5 192.168.2.128
| PPTP Stop-Control-Connection-Reply
|
| Frame 6 (70 bytes on wire, 70 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 56
| Identification: 0x0ea0 (3744)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa64a [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1619
| (1619), Seq: 172, Ack: 56, Len: 16
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 7 0.076525 192.168.2.5 192.168.2.128
| TCP pptp > 1619 [FIN, ACK] Seq=188 Ack=56 Win=64967 Len=0
|
| Frame 7 (54 bytes on wire, 54 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 40
| Identification: 0x0ea1 (3745)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa659 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1619
| (1619), Seq: 188, Ack: 56, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 8 0.076688 192.168.2.128 192.168.2.5
| TCP 1619 > pptp [FIN, ACK] Seq=56 Ack=189 Win=65023 Len=0
|
| Frame 8 (60 bytes on wire, 60 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 40
| Identification: 0xfdef (65007)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x770a [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1619 (1619), Dst Port: pptp
| (1723), Seq: 56, Ack: 189, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 9 0.076711 192.168.2.5 192.168.2.128
| TCP pptp > 1619 [ACK] Seq=189 Ack=57 Win=64967 Len=0
|
| Frame 9 (54 bytes on wire, 54 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 40
| Identification: 0x0ea2 (3746)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa658 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1619
| (1619), Seq: 189, Ack: 57, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 10 4.467397 192.168.2.128 192.168.2.5
| TCP 1648 > pptp [SYN] Seq=0 Len=0 MSS=1360
|
| Frame 10 (62 bytes on wire, 62 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 48
| Identification: 0xfe96 (65174)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x765b [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1648 (1648), Dst Port: pptp
| (1723), Seq: 0, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 11 4.468155 192.168.2.5 192.168.2.128
| TCP pptp > 1648 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460
|
| Frame 11 (62 bytes on wire, 62 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 48
| Identification: 0x11ed (4589)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa305 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1648
| (1648), Seq: 0, Ack: 1, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 12 4.468365 192.168.2.128 192.168.2.5
| PPTP Start-Control-Connection-Request
|
| Frame 12 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0xfe97 (65175)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x75c6 [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1648 (1648), Dst Port: pptp
| (1723), Seq: 1, Ack: 1, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 13 4.468663 192.168.2.5 192.168.2.128
| PPTP Start-Control-Connection-Reply
|
| Frame 13 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x11f1 (4593)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa26d [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1648
| (1648), Seq: 1, Ack: 157, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 14 4.468891 192.168.2.128 192.168.2.5
| PPTP Outgoing-Call-Request
|
| Frame 14 (222 bytes on wire, 222 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 208
| Identification: 0xfe98 (65176)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x75b9 [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1648 (1648), Dst Port: pptp
| (1723), Seq: 157, Ack: 157, Len: 168
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 15 4.471632 192.168.2.5 192.168.2.128
| PPTP Outgoing-Call-Reply
|
| Frame 15 (86 bytes on wire, 86 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 72
| Identification: 0x11f5 (4597)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa2e5 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1648
| (1648), Seq: 157, Ack: 325, Len: 32
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 16 4.479399 192.168.2.128 192.168.2.5
| PPTP Set-Link-Info
|
| Frame 16 (78 bytes on wire, 78 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 64
| Identification: 0xfe9a (65178)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x7647 [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1648 (1648), Dst Port: pptp
| (1723), Seq: 325, Ack: 189, Len: 24
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 17 4.488645 192.168.2.5 192.168.2.128
| PPTP Set-Link-Info
|
| Frame 17 (78 bytes on wire, 78 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 64
| Identification: 0x11ff (4607)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa2e3 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1648
| (1648), Seq: 189, Ack: 349, Len: 24
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 18 4.488818 192.168.2.128 192.168.2.5
| PPTP Set-Link-Info
|
| Frame 18 (78 bytes on wire, 78 bytes captured)
| Ethernet II, Src: HewlettP_38:42:a6 (00:17:08:38:xx:xx), Dst:
| HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy)
| Internet Protocol, Src: 192.168.2.128 (192.168.2.128), Dst:
| 192.168.2.5 (192.168.2.5)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 64
| Identification: 0xfea1 (65185)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x7640 [correct]
| Source: 192.168.2.128 (192.168.2.128)
| Destination: 192.168.2.5 (192.168.2.5)
| Transmission Control Protocol, Src Port: 1648 (1648), Dst Port: pptp
| (1723), Seq: 349, Ack: 213, Len: 24
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 19 4.619231 192.168.2.5 192.168.2.128
| TCP pptp > 1648 [ACK] Seq=213 Ack=373 Win=65163 Len=0
|
| Frame 19 (54 bytes on wire, 54 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 40
| Identification: 0x1239 (4665)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xa2c1 [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1648
| (1648), Seq: 213, Ack: 373, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 20 64.461635 192.168.2.5 192.168.2.128
| PPTP Echo-Request
|
| Frame 20 (70 bytes on wire, 70 bytes captured)
| Ethernet II, Src: HewlettP_ce:ae:5b (00:19:bb:ce:yy:yy), Dst:
| HewlettP_38:42:a6 (00:17:08:38:xx:xx)
| Internet Protocol, Src: 192.168.2.5 (192.168.2.5), Dst: 192.168.2.128
| (192.168.2.128)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 56
| Identification: 0x331d (13085)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x81cd [correct]
| Source: 192.168.2.5 (192.168.2.5)
| Destination: 192.168.2.128 (192.168.2.128)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 1648
| (1648), Seq: 213, Ack: 373, Len: 16
| Point-to-Point Tunnelling Protocol
|
|
|
|
|
| When i'm trying to establish a VPN connection with a computer from
| internet, i receive a new error message:
| "Error 651: the modem (or other connecting device) hs reported an
| error."
|
| and here are packets captured on external server nic:
|
| No. Time Source Destination
| Protocol Info
| 1 0.000000 81.247.173.xxx 192.168.1.10
| TCP 51275 > pptp [SYN] Seq=0 Len=0 MSS=1360
|
| Frame 1 (62 bytes on wire, 62 bytes captured)
| Ethernet II, Src: Watchgua_20:e9:e8 (00:90:7f:20:zz:zz), Dst:
| HewlettP_73:33:d0 (00:1b:78:73:xx:xx)
| Internet Protocol, Src: 81.247.173.xxx (81.247.173.xxx), Dst:
| 192.168.1.10 (192.168.1.10)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 48
| Identification: 0x0cf4 (3316)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 119
| Protocol: TCP (0x06)
| Header checksum: 0x354c [correct]
| Source: 81.247.173.xxx (81.247.173.xxx)
| Destination: 192.168.1.10 (192.168.1.10)
| Transmission Control Protocol, Src Port: 51275 (51275), Dst Port: pptp
| (1723), Seq: 0, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 2 0.000668 192.168.1.10 81.247.173.xxx
| TCP pptp > 51275 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460
|
| Frame 2 (62 bytes on wire, 62 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 48
| Identification: 0x779d (30621)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x01a3 [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 0, Ack: 1, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 3 0.025911 81.247.173.xxx 192.168.1.10
| PPTP Start-Control-Connection-Request
|
| Frame 3 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: Watchgua_20:e9:e8 (00:90:7f:20:zz:zz), Dst:
| HewlettP_73:33:d0 (00:1b:78:73:xx:xx)
| Internet Protocol, Src: 81.247.173.xxx (81.247.173.xxx), Dst:
| 192.168.1.10 (192.168.1.10)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x0cf7 (3319)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 119
| Protocol: TCP (0x06)
| Header checksum: 0x34b5 [correct]
| Source: 81.247.173.xxx (81.247.173.xxx)
| Destination: 192.168.1.10 (192.168.1.10)
| Transmission Control Protocol, Src Port: 51275 (51275), Dst Port: pptp
| (1723), Seq: 1, Ack: 1, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 4 0.026180 192.168.1.10 81.247.173.xxx
| PPTP Start-Control-Connection-Reply
|
| Frame 4 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x77a1 (30625)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x010b [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 1, Ack: 157, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 5 0.051163 81.247.173.xxx 192.168.1.10
| PPTP Outgoing-Call-Request
|
| Frame 5 (222 bytes on wire, 222 bytes captured)
| Ethernet II, Src: Watchgua_20:e9:e8 (00:90:7f:20:zz:zz), Dst:
| HewlettP_73:33:d0 (00:1b:78:73:xx:xx)
| Internet Protocol, Src: 81.247.173.xxx (81.247.173.xxx), Dst:
| 192.168.1.10 (192.168.1.10)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 208
| Identification: 0x0cf8 (3320)
| Flags: 0x04 (Don't Fragment)
| Fragment offset: 0
| Time to live: 119
| Protocol: TCP (0x06)
| Header checksum: 0x34a8 [correct]
| Source: 81.247.173.xxx (81.247.173.xxx)
| Destination: 192.168.1.10 (192.168.1.10)
| Transmission Control Protocol, Src Port: 51275 (51275), Dst Port: pptp
| (1723), Seq: 157, Ack: 157, Len: 168
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 6 0.051195 192.168.1.10 81.247.173.xxx
| TCP pptp > 51275 [RST] Seq=157 Len=0
|
| Frame 6 (54 bytes on wire, 54 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 40
| Identification: 0x77a2 (30626)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x01a6 [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 157, Len: 0
|
| No. Time Source Destination
| Protocol Info
| 7 2.897877 192.168.1.10 81.247.173.xxx
| PPTP [TCP Retransmission] Start-Control-Connection-Reply
|
| Frame 7 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x7965 (31077)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xff46 [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 1, Ack: 157, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 8 5.413371 192.168.1.10 81.247.173.xxx
| PPTP Start-Control-Connection-Reply
|
| Frame 8 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x7a4c (31308)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xfe5f [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51260
| (51260), Seq: 0, Ack: 0, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 9 8.913279 192.168.1.10 81.247.173.xxx
| PPTP [TCP Retransmission] Start-Control-Connection-Reply
|
| Frame 9 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x7bf4 (31732)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xfcb7 [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 1, Ack: 157, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 10 9.569517 192.168.1.10 81.247.173.xxx
| PPTP Start-Control-Connection-Reply
|
| Frame 10 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x7c30 (31792)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0xfc7b [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51261
| (51261), Seq: 0, Ack: 0, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 11 20.944247 192.168.1.10 81.247.173.xxx
| PPTP [TCP Retransmission] Start-Control-Connection-Reply
|
| Frame 11 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x064b (1611)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x7261 [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 1, Ack: 157, Len: 156
| Point-to-Point Tunnelling Protocol
|
| No. Time Source Destination
| Protocol Info
| 12 44.896832 192.168.1.10 81.247.173.xxx
| PPTP [TCP Retransmission] Start-Control-Connection-Reply
|
| Frame 12 (210 bytes on wire, 210 bytes captured)
| Ethernet II, Src: HewlettP_73:33:d0 (00:1b:78:73:xx:xx), Dst:
| Watchgua_20:e9:e8 (00:90:7f:20:zz:zz)
| Internet Protocol, Src: 192.168.1.10 (192.168.1.10), Dst:
| 81.247.173.xxx (81.247.173.xxx)
| Version: 4
| Header length: 20 bytes
| Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
| 0x00)
| Total Length: 196
| Identification: 0x1ee9 (7913)
| Flags: 0x00
| Fragment offset: 0
| Time to live: 128
| Protocol: TCP (0x06)
| Header checksum: 0x59c3 [correct]
| Source: 192.168.1.10 (192.168.1.10)
| Destination: 81.247.173.xxx (81.247.173.xxx)
| Transmission Control Protocol, Src Port: pptp (1723), Dst Port: 51275
| (51275), Seq: 1, Ack: 157, Len: 156
| Point-to-Point Tunnelling Protocol
|
|
|
| Like you advised here:
|
http://groups.google.be/group/microsoft.public.windows.server.sbs/browse_thr
ead/thread/c2a366d431b29158/dd76c2e3a868723c%23dd76c2e3a868723c
|
| i run pptpsrv.exe and pptpclnt.exe and gre packets were successfuly
| received by the server.
|
| I've already used a lot of hours to try to configure a good VPN PPTP
| connection, i've tried with ISA Server 2004 installed on our SBS2003
| server, and without ISA (using only RRAS in this case).
|
| Could you please, help me to find a solution of our problem,
|
|
| Many thanks in advance,
|
| Regards,
|
|
| David
|
|

.

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