Connection Issue

Hi cemcclur,

Please follow below steps to troubleshot the issue,

1. Make sure SQL Server Service is running
2. If a named instance, make sure SQL Server browser service is running. Make sure the instance name is spelled correct. 
3. Make sure SQL Server is configured to allow remote connections
4. Examine the SQL Server error log for messages confirming that SQL is listening on the expected network interfaces and ports
5. Test server connectivity with PING from the client machine
6. Test port connectivity using TELNET to the server and port (from step 4) from the client machine.  For example
TELNET <server-name> 1433
7. Check firewall settings if step 5 or 6 connectivity test fails

If you have some confuse about the steps, please refer to Resolving could not open a connection to SQL Server errors or Troubleshoot connecting to the SQL Server Database Engine to get more information.

Best regards,
Cathy 

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