Remote Client PC Stopped Connecting to VPN

[savaytse66]

I am having trouble getting a client computer at a remote home office to connect to my SBS 2003 VPN. Here is my current setup:

Main Office (my home office):
Comcast -> SBS 2003 (DHCP, R&RA, Exchange) -> Router acting as switch/WAP -> workstations

Remote home office:
Comcast -> Router acting as DHCP/switch/WAP -> client computer

Earlier this week, I was able to connect just fine to the PPTP VPN. It would sometimes take a try or two, but it worked. Now, after changing nothing, the client computer cannot connect at all. I had him run a trace (tracert) to my server, and as soon it hits my server, all of the hops are timed-out.

Where should I start? Is it more likely a setting in his router, something in my access policies, a combination? Again, he was able to connect earlier this week. I'm pretty new to this, so the help is greatly appreciated.

Thanks,
Chris

 

[savaytse66]

Update: He is getting the following Error message when trying to connect:

Error 806: a connection between your computer and the VPN server has been established but the VPN connection cannot be completed. The most common cause for this is that there is at least one internet device between your computer and the VPN server is not configured to allow GRE protocol packets Verify that protocol 47 GRE is allowed on all personal firewall devices or routers. if the problem persists, contact your administrator.

How do I check to see if protocol 47 GRE is allowed?

Thanks again.

 

[burtsbees]

Any IP alias on the external NIC? Also, Make sure in your server publishing rule that the PPTP filter is bound to the PPTP protocol.

Burt

 

[savaytse66]

We're using the IP address to connect, if that's what you mean, not domainname.com. How do check the publishing rule for PPTP?

Thanks,
Chris

 

[savaytse66]

An update:

I was at the remote office yesterday, and I was able to successfully connect to the VPN with my laptop. My laptop was on a wireless connection connecting through the same router his PC is connecting through. The configurations are the same on both computers regarding the VPN setting.

At this point, I'm wondering if it's not a bad cable connecting his computer to the router. I didn't have another one to test with.

 

[burtsbees]

Could be...

Burt

 

[savaytse66]

Man... I swapped the cables, and he still cannot connect. What could possibly be wrong? I am using Vista x64 on the client computer. Could this have anything to do with it? My main office computer also runs Vista x64, and I can connect just fine, although that computer is within the network already.