>>Hi,
>>
>>I've installed SQL Express 2008 R2 on a server and created a named instance: SQLExpress.
>>
>>In trying to connect to this server from PCs on the network I get this error during setting up an ODBC connection:
>>
>>Connection failed:
>>SQLState: '01000'
>>SQL Server Error: 11004
>>[Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]ConnectionOpen (Connect())
>>Connection failed:
>>SQLState: '08001'
>>SQL Server Error: 6
>>[Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]Specified SQL server not found
>>
>>I have:
>>
>>1. ensured that ports 1433 and 1434 are open in the firewall on the server
>>
>>2. Ensured the SQL Browser service is running
>>
>>3. Double checked the name of the server (GFSL01\SQLExpress) by looking in SSMS
>>
>>4. Ensured that remote connections are allowed by looking at the Server Properties in SSMS
>>
>>What else could I be missing?
>
>Windows OS permissions for the client machine to access the server ?

Any idea what I need to check for that?