Connection error

Hi All
when i try to register an instance of SQL server sometimes it's registered
successfully and sometimes not, giving me the error SQL server Error:17 SQL
server does not exist or access denied.
I installed service pack 3 and i still get error.
Also when i try to add a Data source, i can do it successfully using named
pipes as the network protocol but it fails with TCP/IP.
Thanks for your helpWhat is the OS Error printed when the connection fails from a Test ODBC DSN?
Example: 11001 , 10060 These are sockets errors.
Post the Exact error message and/or search on the errors in the kb article.
Thanks,
Kevin McDonnell
Microsoft Corporation
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