TCP/IP Connection to SQL Server

When I run the Diagnostics Tool, I am getting a Warning that TCP/IP is not enabled to access SQL Server. I went into the SQL Server Configuration Tool and TCP/IP is Enabled. Why am I still getting the warning and how do I fix this? Thanks.

Check if the alias of the SQL server is correct. I have always used either MSSQLSERVER which is default in addition to the name of the server

Yes, that is the name I have also. Any other ideas?
Thanks.

Check the IP-adress of the SQL-server:

Therafter I will check the ODBC- data sources and compare the DSN in the registry:

It should be the same both places:

Did you ever solve this issue? I am experiencing the same issue.

I have the same error too