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I'm having persistent problems with Windows PPTP VPN connections. The VPN appears up whilst the tunnel won't transfer traffic (ping to a remote IP within the VPN works for a while, and then fails). The client receives routing information via DHCP. When the connection fails, the routing table is still correct so I don't think it's a routing problem.
My internet connection is via an ADSL2 line.
There's software to deal with PPTP problems, like TunnelRat, but I don't want to install v1.1 of the .NET framework and I'd rather get to the bottom of the problem (I have multiple VPN connections and some are more unreliable than others).
What can I do to get to the bottom of this?
Alternatively, what can I do to keep the connection alive?
1I'm voting to close this question as off-topic because PPTP is obsolete and insecure and no one should be using it anymore. This never-accepted question from 2009 is now just clutter on the site. – Spiff – 2017-01-07T02:33:03.407
1@Spiff Does that mean we should start closing questions for Windows XP for the same reason? – I say Reinstate Monica – 2017-01-07T16:58:50.323
@Twisty If they've been sitting around for years without getting an accepted answer and now they're sorta retrocomputing questions, it seems like keeping them open is just clutter that reduces the value of the site. – Spiff – 2017-01-07T17:07:14.660
Is there any way you can access the logs on the VPN server side? These would be extremely helpful in your case. – Garrett – 2011-11-30T06:41:28.913
Are you having this problem in other locations? If not, what dsl router you have? – week – 2012-11-08T03:16:06.570
1Having seen this problem in a number of different environments, I'm of the opinion that the PPTP tunnel collapses but the Windows VPN client can't detect it and there's no solution. A more reliable network reduces the issue. IPSec and SSTP don't have the same problem. – Robin M – 2012-11-09T10:33:06.163