Connect to a SQL Server 2000 Instance with ODBC on Windows..

With a Data Source ODBC, I am able to connect to my SQL Server Instance in
"Named Pipe" mode but not in TCP/IP mode.
(Firewall is disable)

I always got:

Connection Failed:
SQLState:'01000'
SQL Server Error: 53
[Micosoft][ODBC SQL Server Driver][DBNETLIB] ConnectionOpen (Connect()).
Connection failed:
SQLState:'08001'
SQL Server Error:17
[Micosoft][ODBC SQL Server Driver][TCP/IP Sockets]SQL Server does not
exist or access denied

The client network utility Port is the same as in my ODBC connection.