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SBS 2011 VPN Problems

Posted on 2014-01-17
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Last Modified: 2014-03-10
Hi some of our SBS 2011 users that connect via VPN are being disconnected and random times and they have to then reboot to be able to connect again.

Im just going to do some testing but is there somewhere I can see who is connected at any one time?

Also should there be events in event viewer to show the connection and possibly the logoff/disconnect as I cant seem to find anything.


Thanks
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Question by:RedDoorSupplies
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by:WORKS2011
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If you're using the 192.168.0.0 network you can have problems because many home routers use the same IP address. I changed my SBS2011 ip network to 192.168.25.0 network and the problems went away.
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by:RedDoorSupplies
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Yes did think of that and the range is 192.168.42.x

It seems to work ok for a few weeks then the problems start, if I give the server a restart it will solve the issue for a bit but then comes back.

Is there a limit on the amount of connections the server will take at the same time?
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by:David Atkin
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Hello,

You can see the active VPN Connections by opening Routeing and remote Access in Administrative tools.  This may help troubleshoot. I would advise against making changes in here though.

As WORKS2011 suggested. Check to make sure that your remote sites don't have the same IP Range.  If they do then this won't work.  Each site needs to be on a different IP Range for routing and addressing to work correctly.
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by:WORKS2011
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If more than one user is having issues I would restart the switch, it's a single point of failure. If it's managed then check the logs. I would verify the router firmware is updated, restart, and check the logs. It's likely not the server unless DHCP is giving out too many IP's.

Check DHCP and see if there are duplicate IP entries. The ip's with phone symbols are VPN, you can delete them. Check for duplicates and check the DHCP logs, you can get to the logs by expanding DHCP it's at the very bottom.
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by:WORKS2011
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Also do a bandwidth test if your upload speed is too slow you can have this problem.

I use Speakeasy, click here note, don't run it from the server it uses flash.
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by:Olaf De Ceuster
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Please try dropping the MTU on your routers.
Hope that helps,
Olaf
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by:RedDoorSupplies
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Ok I have asked the user to delete his VPN connection and re-add it and so far I haven't had any calls to say the connection is dropping.

I am going to keep an eye on it and see how we get on.

Thanks for all the help so far.
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RedDoorSupplies earned 0 total points
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Hi it turned out the SBS server is limited to 5 users connecting at any one time, I have increased the number to 10 and the issues have been resolved.

Instructions can be found here

http://www.sbsfaq.com/?p=3461

Thanks
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by:RedDoorSupplies
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Found the solution on a different site
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