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VPN Error 721 on Windows XP Machines

Posted on 2004-10-05
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Last Modified: 2010-03-18
I have found a common problem on most Windows XP machines, where I cannot connect on a Microsoft VPN (error 721) to a Windows 2000 / 2003 server. However, on the same network with the same gateway, I can connect using a Windows 2000 machine. And the REALLY weird thing is, if I firstly connect using the Windows 2000 machine, the Windows XP machine then connects ok. I have found this issue with all versions of XP, with SP1 and 2.  Does anyone know of any fixes to help solve this problem?

Thanks a lot,
Daniel Murfitt
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Question by:DClayden
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by:Eric
ID: 12228757
personal firewall on the xp client is the first thing that pops into my head.  specially with sp2.
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by:DClayden
ID: 12235494
We have made sure the XP firewall is always off on all PCs. This still wouldn't explain why it works when using a 2000 machine on the same network. Weird. Any ideas?

Thanks,
Dan
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by:Eric
ID: 12237422
are you testing local to the server or over  the internet?
2000 does not have a firewall.. so that makes sense to me, except when you first connect with 2k, xp works :|
heh

If possible do the testing on the local network.  check the netbios settings on the connections.
do an ipconfig /all on both.. is there any differences?
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by:DClayden
ID: 12285388
We are using a LAN, with a Cisco router. All the PCs are on the same subnet, using the same gateway. We don't use the XP firewall, as we have a Cisco firewall which protects the whole network. It's just so weird. If you try and VPN with the XP machine it says connecting, then says verifying username and password...sits there for a while...then bombs out with error 721: the remote computer did not respond. However, connect to the same VPN with the 2000 machine, goes straight in really quickly, and THEN connect the XP machine on the same VPN; no problem at all. Can anyone explain this?

Thanks,
Daniel Murfitt
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Eric earned 250 total points
ID: 12286946
Sounds bizzar.. i give you that :)

I still am not sure how  your testing these machines.  Test them on the local network.  IE: they are pluggedinto the local eithernet, and then you connect to the vpn (vs doing it outside your network, or through dialup)

That will eliminate some problems.  Go through your networking properties with a fine tooth comb.  Are all the netbios/ netbios over tcpip  domain sufix.. etc.. settings all exactly the same?  Area are all computers members of the domain and logged in already.. or using cached credentials?    

besides checking those things you got me stumped.

GL
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by:DClayden
ID: 12470897
I think it might be something to do with the GRE on the router...?

Any ideas...?
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