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SBS 2008 VPN Connection causes blue screen

Posted on 2010-11-25
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Last Modified: 2012-05-10
We recently installed a new HP SBS 2008 server as a single domain controller. During installation DHCP address range was picked automatically from the router (10.0.0.1 - 10.0.0.255) and the server itself was assigned 10.0.0.2.

All was working well except when I connected my iPhone using VPN. After two or three connections and disconnections the server consistently failed with a blue screen. The memory dump indicated issues with the network driver. Other devices and PCs did not cause this issue.

After extensive investigation by HP, where no hardware fault could be found, the cause was found by ourselves to be the allocation of IP addresses to the WAN Miniports used by VPN. In this case DHCP was allocating the server IP itself (10.0.0.2) to the VPN connection and it was this conflict that caused the blue screen

Our solution was to change the IP address of the server to one much higher up the range (.222). The WAN Miniports always seem to be allocated low available numbers such as .2.3.4.5 etc.

Thought this information might be useful to others and would appreciate any comments from those of you who understand these things as to why it happened.
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Question by:clydecomputing
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Expert Comment

by:Rob Williams
ID: 34213673
Thanks you clydecomputing for your findings.
Just to add to that:
SBS has numerous requirements. The most important being the wizards are used, and although it is not compulsory, the SBS should be the DHCP server. If the latter is not going to be the case see the following:
http://sbs.seandaniel.com/2008/10/do-i-absolutely-have-to-run-dhcp-on-sbs.html

When you run the Connect to the Internet address wizard it will set up DHCP on the server and also create an exclusion for the server IP so that what you are experienced cannot happen.
To further avoid a conflict it is important to use the VPN wizard from the SBS console and not the RRAS wizard.
Following SBS Best practices, which can be confirmed by the Best Practices Wizard below, should avoid such problems.
http://www.microsoft.com/downloads/en/details.aspx?familyid=86a1aa32-9814-484e-bd43-3e42aec7f731&displaylang=en
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Author Comment

by:clydecomputing
ID: 34213738
Thanks for the comment. The SBS server is the DHCP server and we did use the connect wizard when setting up the server. Should we now add the new server IP as an exclusion?
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Rob Williams earned 50 total points
ID: 34213765
Odd that it didn't do that by default, but yes it is a good safety.
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Author Closing Comment

by:clydecomputing
ID: 34233463
Problem had largely been resolved prior to post
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