RE: SBS PE - Unable to establish Outbound VPN

Hi Crina

Thank you for your response. What we are trying to do is connect to a
remote server via PPTP from inside the SBS network. I understand that the
firewall client does not support this and secure NAT must be configured (it
is). To assist in testing I have tried to connect from the SBS server to the
remote server and still get error 628. Note that I have another SBS (in
another location) with the same configuration and I can connect to the remote
server.

I have created a PPTP outbound rule as described in 838245 and also note
there is a SBS PPTP Outbound rule. I still see the same error.

Regards

Andy

""Crina Li"" wrote:

Hi Andy,

Thank you for posting in the SBS Newsgroup.

From the description, do you mean you want to let internal clients to
connect to an external VPN server through SBS with ISA 2004 or VPN to SBS
with ISA 2004 from remote client?

If it is former, due to you have ISA 2004 installed on SBS, please refer to
the following information:

As I know, the firewall client application identifies the internal/external
traffic according to the LAT and the routing table. When the traffic is
identified as outgoing external traffic, it would be picked up by the
firewall client application and then sent to the ISA server. Since the
remote VPN network is not in the local ISA server's LAT (for ISA 2004, it's
the address range of internal network objects), the firewall client picks
up the traffic and send it to the ISA server. Generally speaking, to use a
VPN client through the ISA server, we recommend the client use SecureNAT
mode. You may refer to the following KB article for the detailed
information:

838245 How to permit PPTP clients to access the external network through ISA
http://support.microsoft.com/?id=838245

887006 When you use the ISA 2004 Firewall Client program, you cannot make a
http://support.microsoft.com/?id=887006

Please also run CEICW and select Enable firewall and then make sure Virtual
Private Networking (VPN) is selected in the Services Configuration page.

If it is the later, please refer to the following steps:

1. Run CEICW, follow the wizard and select Enable firewall and then make
sure Virtual Private Networking (VPN) is selected in the Services
Configuration page. And make sure you have typed the public FQDN of the SBS
server on the Web Server Certificate page.
2. Run Remote Access Wizard in Server Management\Internet and
E-mail\Configure Remote Access, and select VPN access in the Remote Access
Method page. After finishing this wizard, RRAS is configured to allow
inbound VPN access, and it can assign IP addresses to the VPN clients by
using DHCP.

Note: When we run the remote access wizard to set up the VPN service, we
need to input the public IP address or the public FQDN of the SBS server.
We need to make sure that the address can be accessed from the internet.

3. On the VPN client, go to https://publicFQDN/remote, clear I'm using a
public or shared computer, log in and download Connection Manager.
4. Install Connection Manager on the VPN client.
5. Is there a hardware router installed in front of the SBS server? If so,
ensure that the port forwarding for TCP 1723 and GRE port (protocol number
47) are opened. PPTP VPN is negotiating a connection on TCP port 1723 and
send data to and from the PPTP server using the GRE protocol (IP Protocol
47, 0x2F if you are looking in Network Monitor). You should open port 1723
on the router and also make sure IP Protocol 47 is allowed.

More information:

323441 How To Install and Configure a Virtual Private Network Server in
Windows
http://support.microsoft.com/?id=323441

886621 You receive an "Unable to establish the VPN connection" error message
http://support.microsoft.com/?id=886621

ISA Server 2004 Performance Best Practices
http://www.microsoft.com/technet/prodtechnol/isa/2004/performancebestpractic
es.mspx

How to configure networks in ISA Server 2004
http://support.microsoft.com/?id=867483

What's New and Improved in ISA Server 2004
http://www.microsoft.com/isaserver/evaluation/whatsnew.asp

ISA Server 2004 Quick Start Guide
http://download.microsoft.com/download/3/7/b/37b0cbc4-e578-4082-a779-de4fbe8
76f06/ISA2004SE_quickstartguide-Rev%201%2003.doc

ISA Server 2004 ISA Server 2004 Configuration Guide
http://download.microsoft.com/download/3/7/b/37b0cbc4-e578-4082-a779-de4fbe8
76f06/ISA2004SE_configguide-Rev%201%2003.doc

I appreciate your time and look forward to hearing from you.

Best regards,

Crina Li (MSFT)

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--------------------
| Thread-Topic: SBS PE - Unable to establish Outbound VPN
| thread-index: AcbHrs4VgukD5xbKT6CfdXO+tcUacQ==
| X-WBNR-Posting-Host: 70.88.138.214
| From: =?Utf-8?B?QW5keSBI?= <AndyH@xxxxxxxxxxxxxxxxxxxxxxxxx>
| Subject: SBS PE - Unable to establish Outbound VPN
| Date: Thu, 24 Aug 2006 11:55:02 -0700
| Lines: 31
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| X-Tomcat-NG: microsoft.public.windows.server.sbs
|
| I am having some difficulty at one client site (SBS PE with ISA 2004)
| establishing PPTP VPN connections. I keep getting an error 628, the
| connection was terminated by the remote computer before it could be
| completed. I have tested from the server and from client workstations
| inside the network with the same result. When I try from my network
| (exactly the same config right down to ISA rules), I do not have any
| issues.
|
| Turing on ISA realtime monitoring, I can see the connection being
| established with the right IP, destination port 1723, PPTP, Initiated
| Connection with the SBS PPTP Outbound Access Rule. Next line is same
| IP, destination port 0, PPTP, Initiated Connection, SBS PPTP Outbound
| Access Rule.
|
| Next 2 lines are for destination ports 1723 and 0, Closed Connection,
| SBS PPTP Outbound Access Rule.
|
| When making the VPN connection you can see it getting as far as
| verifying username and password before error 628 pops up.
|
| Outside of the ISA server they have a Draytek Vigor firewall, and we
| have successfully established a PPTP connection from behind it, ruling
| it out of the equation I think!
|
| I have searched and can find no solutions to this. I have tried it from
the
| server and from client workstations with the firewall client disabled.
|
| Wonder if anyone has any ideas.
|
| Andy
|
|


.

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