Just recently I encountered an issue with a brand new Dell T110 running SBS 2008. I thought it may be useful for others to know how this was resolved.
The issue I was experiencing was as follows:
When I restarted the Server it would remove the ‘Default Gateway’ settings in the network card and would then not be able to access the internet. In order to correct this issue I would need to run the ‘Fix my Network’ wizard from the Windows SBS Console under the Network > Connectivity sub-tab.
The following fantastice article explains the problem and how to correct this issue.