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How can we stop VPN disconnects in SBS 2008

solplus
solplus asked
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Last Modified: 2012-06-27
Hi,

We have a situation where a remote user is being disconnected when connecting to his office server via a Windows RAS VPN.

The server is an HP Proliant ML110 running SBS2008. The client is an HP laptop running Windows 7. There are Netgear routers at both sites.

There doesn’t seem to be any pattern to the disconnects. We tried constantly pinging the server to keep the connection open and while this has reduced the number of disconnects significantly and extended the time in between them it, the problem continues.

At the time of disconnection the RAS log shows:
[6052] 04-26 20:01:26:947: WorkerThread: Disconnect event signaled on port: VPN2-4
[6052] 04-26 20:01:26:947: OVEVT_DEV_STATECHANGE. pOverlapped = 0x3a79880
[6052] 04-26 20:01:26:947: d:\longhorn\net\rras\ras\rasman\rasman\worker.c, 2020: Disconnecting port 0, connection 0x0, reason 1
[6052] 04-26 20:01:26:947: Disconnecting Port 0xVPN2-4, reason 1
[6052] 04-26 20:01:26:947: DisconnectPort: Saving Bundle stats for port VPN2-4

(There is a lot more information in the log – I have only included the first 5 lines).

What is causing the disconnects? How can we stop them?
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Cris HannaSr IT Support Engineer
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Commented:
What kind of netgear routers are these the 49.00 routers you can get at Best Buy or are they Netgear Business Grade routers

What is the bandwidth / type of internet service

Max number of simultaneous VPN connections and number of internet users at the SBS location?

Author

Commented:
One end has "business grade", the other is cheap & cheerfull. Both ends are ADSL broadband, however, the laptop end of the VPN can/does connect from various locations who's broadband cannot be controlled. There is only one VPN connection and 2-3 users at the SBS location. Your questions imply that the performance of the connection might be related. I would have thought that it might affect the performance over the VPN but not that it would cause a disconnect?
Cris HannaSr IT Support Engineer
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Author

Commented:
I am fairly sure that the MTU setting is the answer, but the VPN user is out of the country until next week so I cannot check this out. I will post a comment/solution next week.
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Commented:
Sounds good, let us know how you make out.
--Rob

Author

Commented:
Still unable to test yet - cutomer returns from his travels in 2 weeks time

Author

Commented:
Sorry, I forgot to update this. Decreasing the MTU improved the situation greatly and disconnects are now much less. Before I close, Robwill also mentioned "...you will need to enable "keep Alive" which affectively does the same as the ping. Otherwise the VPN connection will most certainly be dropped after a specific idle period". Where and how can this be done? I have looked in "Routing and Remote Access", but cannot see an option for this?
Thanks
Alan
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Commented:
Hi solplus. Glad to hear you have some improvement. The keep alive option is not in RRAS but rather in the modem configuration and/or in your router configuration. On the router config it is usually on the WAN interface configuration page, but generally only exists with PPPoE and PPPoA connections. This can also be at the client end, probably out of your control.
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