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Domain Controller Reboot problem

Yesterday we had a very strange problem.

Last week our dns and DC's were upgraded to Win 2008

Yesterday, After the DC reboot, Sharepoint crashed. trying to understand what happened, I saw that SQL server was unable to accept new connections and was continuously throwing this errors:


Event Type: Error
Event Source: MSSQLSERVER
Event Category: (4)
Event ID: 17806
Date: 6/23/2010
Time: 10:05:26 AM
User: N/A
Computer: SRV29
Description:
SSPI handshake failed with error code 0x80090304 while establishing a connection with integrated security; the connection has been closed. [CLIENT: 10.3.0.49]


For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.


---

Event Type: Failure Audit
Event Source: MSSQLSERVER
Event Category: (4)
Event ID: 18452
Date: 6/23/2010
Time: 10:05:26 AM
User: N/A
Computer: SRV29
Description:
Login failed for user ''. The user is not associated with a trusted SQL Server connection. [CLIENT: 10.3.0.49]

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

I was panicked, that was really trouble! The first thing I did was to restart the SQL Server service, and an IIS reset on the WFE of Sharepoint side..


But it didnt work. So I reboot both the WFE and SQL Server of Sharepoint farm and everything started to work again.


After a little investigation, we saw that our technician had entered only the first DNS , forgot the second. After he entered both DNS we reboot the DC machines again and everything went fine. -Actually, there was a 5 seconds of interruption, which could be seen on SQL server's event log but it  did not cause any service interruption and SharePoint & other applications was not affected.-


So If you encounter this errors after DC reboots, check if the dns name resolving is working..

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