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In my home network, I have three machines - trying to do a lab for mirroring on SQL 2008. 

> Machine A can connect to B and C.  

> Machine B can connect to A and C.  

> Machine C cannot connect to A nor B.

By connect - I mean clicking Connect in SSMS (Sql Server Mgt Studio) and entering the machine-name\instance name and using SQL Server Auth with a common user/pass. I have also tried System Admin Tools, ODBC System DSN and it cannot connect.

Firewall is off on all machines. SQL Server Configuration Manager -Network Configuration - on all machines has enabled Named Pipes, Shared Memory, and TCP/IP.

Machine C can access files on a share on A with no problems, and wireless internet working fine.

Sorry, we've been fighting this now for about an hour and a half.

I'm trying to install a Vista Telnet to check ports, but that was taking time.

Thanks for any ideas on how to get Machine C to connect?

Update: from ODBC tried "SQL Server" instead of "SQL Server 10" and it connected. Microsoft SQL Server ODBC Driver Version 06.00.6001.

Clarification Update: om ODBC tried "SQL Server" instead of "SQL Server 10" and it connected. Microsoft SQL Server ODBC Driver Version 06.00.6001. Still don't under stand why "SQL Server 10" from ODBC won't connect. Still cannot connecst using Sql Server Mgt Studio.

Clarification Update: the specific error is as follows... Cannot connect to the "server." Additional Information -> A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (.Net SqlClient Data Provider).

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This may be related to the way the services start up. Check that the SQL Server service on all three machines is running under the same context / user (e.g. it might be Local Service, Local System, or Network Service). – Randolph West Jan 5 '10 at 14:19
Dupe of serverfault.com/questions/99366/… (which was moved over from SU) – squillman Jan 5 '10 at 14:36
All the systems are running under Local System. I have rechecked the settings; as far as I tell, they all seem to be identical. Is there something else I can check? – Jim Messler Jan 6 '10 at 14:56
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