Re: Unable to connect to ISA Server VPN from External Network. Err

Well .... in that case ... i guess you have no chave of putting pptp
tunnels to work ...

I guess either you buy a router that supports redirecting GRE or use
some old PC with a USB modem ... if you have any :)

Pedro A.

Habibalby escreveu:
Hello,

Unfortuently my Router doesnt' allow the GRE Packets to be forwarded, that;s
why I have disable the Packets totally and disabled the FIrewall as well.

Any thoughts

Thanks,
"praraujo@xxxxxxxxx" wrote:

Hello,

Have you allowed GRE Protocol IN ?

See if your router allows it and then ... just do it :)

Pedro A.

Habibalby wrote:
Hi,

I Have all the Packets Filtter are disabled, Firewall, Hacker Block in the
ADSL Router. It means that the ADSL Router is just providing me a NAT and
providing me PPPOA Services from my ISP.

Any Recommandation?

"praraujo@xxxxxxxxx" wrote:

erm ... have you configured the GRE protocol on the router ?

No GRE no PPTP through ROUTER ...


Pedro A.


Habibalby escreveu:
Hi Guys,

I have implemented an ISA Server Firewall based VPN on a test Network, and
whenever I try to connect from External Network to ISA Server I get Verifying
username and Password and it end-up with Error: 721.

My Network setup as follows:

ISA Server 2004 with 3 NICs and the Network Template as a 3-Leg Perimeter
Network.

here's my Network Diagram [http://i14.tinypic.com/2yn5kxw.gif]

NICs as per the Binding Structure.

LAN
WAN
DMZ

The network Template I have is 3-Leg Network. The Network Relationship I
have is:

NAT from Internal to External
NAT from DMZ to External
Route between DMZ and Internal.

All the settings are working perfectly without any problem in internet
browsing, sending mail and accessing FTP from External to my FTP Server.

However, after configuring the ISA Server to act as a VPN Server, I'm unable
to connect from External to the ISA VPN Server. Whenever I try to connect I
got an error 721.

The VPN Protocols configured as PPTP and 1723 TCP port is mapped from the
ADSL Router to the External Interface of ISA Server.

VPN Server already published on ISA Server to accept incoming PPTP
connection from External to ISA Server on 10.90.8.2 Internal

The DHCP Server is configured on the ISA Server and the rules as follows:

DHCP Request from Internal/VPN Clients to LocalHost All Users
DHCP Reply from LocalHost to Internal/VPN Clients All Users


When I connect a P.C in the External Subnet 10.90.8.x and try to establish a
VPN connection to ISA Server, it connects and I'm getting an IP Address from
the DHCP Server.

But whenever, I try to connect from the External to Internal Network, it
shows it's Verifying username and Password and it end-up with the Error:721

Any idea how to solve this problem?

Thanks for your corporation.

Habibalby





.

Relevant Pages

  • Re: Unable to connect to ISA Server VPN from External Network. Err
    ... See if your router allows it and then ... ... whenever I try to connect from External Network to ISA Server I get Verifying ... DHCP Request from Internal/VPN Clients to LocalHost All Users ...
    (microsoft.public.isa.vpn)
  • Re: Connecting ISA
    ... > Connecting the ISA server to the router will I need a crossover cable? ... >> One NIC, the one to the internal network, should be assigned an internal ...
    (microsoft.public.isa.configuration)
  • Re: ISA Installation
    ... Place your ISA server instead the existing router. ... the ISA server should have at least 2 interfaces to perform as ... One interface is for local network and the ...
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  • Re: Unable to connect to ISA Server VPN from External Network. Err
    ... See if your router allows it and then ... ... whenever I try to connect from External Network to ISA Server I get Verifying ... DHCP Request from Internal/VPN Clients to LocalHost All Users ...
    (microsoft.public.isa.vpn)
  • Re: Unable to connect to ISA Server VPN from External Network. Err
    ... It means that the ADSL Router is just providing me a NAT and ... whenever I try to connect from External Network to ISA Server I get Verifying ... DHCP Request from Internal/VPN Clients to LocalHost All Users ...
    (microsoft.public.isa.vpn)
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