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WinXP hitting Win2k VPN

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by andydufrane

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I'm running SBS with the RRAS VPN up and running. I have an XP user that wants to hit our VPN from home. I've verified that the user has all necessary permissions to log on to the VPN. Before I installed a Linksys low-end firewall, the user could use XP to hit the VPN just fine. Ever since the firewall was put up, we get an "Error 800: VPN server is either not available or not responding" message.
I've looked at my firewall settings and I'm allowing both IPsec passthrough and PPTP passthrough. I do not have any other special ports blocked. I can log on to the VPN from a Win2k machine and a WinME machine.
From what I figure, it's got to be some setting on the XP machine that I dont' know about... or the VPN is blocking the traffic coming in. I've checked logs and I see the user's ip hitting us and successful TCP packets going through the firewall... I'm stumped. Can anyone help?

5 replies

by timwalsh

You sort of answered part of your question (I suspect). Things worked before the firewall was added. Now things don't work. It would be logical that something with the firewall is causing problems.

Check out the Linksys Knowledgebase article KB10934374 Connection problems to a VPN server behind a Linksys router. This looks like it might match your situation.

Hope this helps.

by andydufrane

You were spot on about the firewall. Although that particular KB article wasn't it, I did find one that appears to have done the trick. Thank you very much for your help!

by ecvogel

We tried a Linksys but gave up and bought a second network card for the server and used MS Proxy 2 for SBS 4.5 and now ISA 2k (Internet Security & Acceleration Server). You go into the Admin Console for the SBS, To-Do's and run the Internet Connection Wizard to configure the firewall. Make sure you check VPN along with other services you will use. It will do the rest. I suggest going to SBS 2000 or soon SBS 2003 for a better firewall. (I read that MS Proxy was not the great.) Just keep up on the services packs and install SP1 for SBS 2000.

I had alot of trouble with MS Proxy 2, but nothing biggy with ISA 2k, and you may have none with ISA 2k.

1rst NIC: 100 Mbs LAN
2nd NIC: 10 Mbs WAN (Connects to the Telocity, Now DirecTv DSL Gateway. (DirectTv DSL is pulling the plug on DSL.)

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