users cant connect to sql server "Connection Failed SQL State 08001"

This is an existing installation that was working.  We had this problem on Friday and restarted everything thing and it was ok.  It has happened before on restarts.

I can connect to the sql server by name on sql studio mgr from the same machines.  BUt the MS Access App throws error:

SQLState: '08001
SQL Server Error: -1
[Microsoft][SQL Server Native Client 11.0] SQL Server Network Interfaces: Error Locating Server/Instances Specified[xFFFFFFFF]
Connection Failed:
SQL State: 108001'

Again this was all working this morning and for years before.

error screen shot
pressMacAsked:
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plusone3055Commented:
there are several reasons that could occur

I have an excellent article that would run through the most common instances with step by step fixes.

https://www.mssqltips.com/sqlservertip/2340/resolving-could-not-open-a-connection-to-sql-server-errors/

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pressMacAuthor Commented:
OK, the server on which the SQL Server resides is a domain controller.

I had already rebooted that.  Then for the second time, i rebooted the other domain controller.

Then everyone was able to login.

However, i would like to identify the problem.  Some sort of named pipe issue i am figuring.

It is working now, but per the above document, i am able to ping the server by ip and name, but not instance.

Preston
Vitor MontalvãoMSSQL Senior EngineerCommented:
Domain controller should remain as is and not for others purposes.
Imagine that SQL Server needs to connect to DC but isn't available yet in the time the service starts? It would be never able to be available.
You should think in removing SQL Server from DC server and install it in another machine.
pressMacAuthor Commented:
I never actually figured out solution to the problem aside from multiple re-bootd.  I think the sql server tries to get going to be all the dns is in place or something like that.  For that reason i also award to 250 to Vitor for the suggestion to move the sql server to its own machine.
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