On SQL Server 2005 Express Edition (I don’t know how’s on full version, never had a license for it) the default connection model is through named pipes and TCP/IP is disabled.

If you want to connect to it from Oracle SQL Developer using jTDS driver it will throw a generic connection failure, as he is trying just TCP/IP. The error looks like this:

1. From SQL Server Configuration Manager, go and expand “Network Configuration”, choose “Protocols for SQL Server Express” and enable TCP/IP

2. Open TCP/IP properties page, go to the second tab “IP Addresses” and in the last field called “IPAll – TCP Port” enter your port number. You might want to choose 1433.

3. Restart SQL Server Express service.

http://www.webxpert.ro/andrei/2009/05/31/enable-tcpip-on-sql-server-2005-express-edition/

4. JDNI Connection Sample:
jdbc:sqlserver://localhost:1433;DatabaseName=Uppetrol

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