Ok, so it's using the SSNETLIB.DLL, but as shown by this line

"2005-05-03 15:32:30.26 server SQL server listening on Shared Memory, Named Pipes."

The server is NOT listening on TCP so therefore it doesn't matter what DLL it loads. If it was, you would see a message alongs the lines of,

SQL server listening on TCP, Shared Memory, Named Pipes.

As mentioned by sivaprasad, check the Server Network Utility. Make sure TCP/IP is enabled, if it's already enabled, disable it, reboot the server and re-enable it.