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Windows XP VPN client to Windows 2003 SBS VPN Server. Disconnects after a few minutes.

Hi All,

I have a Windows 2003 SBS with ISA 2000 set up as a VPN Server. I have a Windows XP Pro client that is connecting through to it. It seems that after only a few minutes, the VPN connection is ended without any error messages. I am using PPTP and certificates for authentication.

I have checked Remote Access Policy settings regarding limits/idle times etc. and they all seem ok. I have tried connecting the vpn and then running a constant ping to the VPN server, but it still disconnects. I have tried two different client pc's, both running Windows XP Pro. The Windows 2003 server sits behind a Netgear DG834 DSL Modem/Firewall that has the latest firmware. It is passing all traffic for PPTP onto the external IP of my SBS. I found a solution on this site that suggested reducing the MTU in the DG834 from 1500 to 1460. I also tried doing this on my XP computer with the help of TCPOptimiser. None of what I have done above has made any difference whatsoever.

I have spent quite a few hours researching this problem but have been unable to fix it so far. I would appretiate any help that can be offered.

Cheers!

Peter    
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PeteJH
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PeteJH
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1 Solution
 
PeteJHAuthor Commented:
I have also just installed Windows XP Service Pack 2 on one of the clients and the disconnections still occur.
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humeniukCommented:
This probably isn't the answer you're looking for, but when I had the same problem, I messed around with it for a while, pulled out some hair, and then bought a couple of VPN routers.  Life is good.
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PeteJHAuthor Commented:
I have thought about it, but I don't see any reason why this shouldn't work and refuse to let it beat me.

btw, I have also tried putting my DSL Modem/Firewall into DMZ, forwarding all traffic through to the VPN server, but that hasn't helped.

Cheers,

Peter
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adamdrayerCommented:
are you using ICS on either side?
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PeteJHAuthor Commented:
Thanks for your response,

The VPN server is a Win 2003 SBS. It has two networks cards installed for LAN and WAN and has the Routing and Remote Access service running as well as ISA 2000. So it is sharing the internet connection, but is not using ICS as such. I have made sure that the client pc's are not running ICS either.

If you are leaning towards the MS KB article that has a title like "VPN disconnects after 55 seconds" I have already checked it out and this is why I installed XP Service Pack 2 on one of the clients to see if it made a difference.

Cheers,

Peter
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adamdrayerCommented:
thanks.  that's what i was look at.
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PeteJHAuthor Commented:
Turns out the ADSL Router/Firewall at the clients end was causing the problem. I upgraded the firmware on it and all is well.
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PeteJHAuthor Commented:
How do I refund the points for this question?
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humeniukCommented:
Glad to hear you're up and running.

Your options for closing the question are here: www.experts-exchange.com/help.jsp#hs5.  Essentially, you want to post a question in Community Support (www.experts-exchange.com/Community_Support) asking a moderator to close the question because you resolved it yourself.
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ee_ai_constructCommented:
Question answered by asker or dialog valuable.
Closed, 500 points refunded.
ee_ai_construct (replacement part #xm34)
Community Support Admin
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