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:

In ordrer to enable TCP/IP you have to do a few steps:

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.

4. Try again from SQL Developer. This time will work!

Good luck,
Andrei

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A bit of background information: SQL Developer is connecting to SQL Server through JTDS opensource driver. The driver said that it cannot support named instances. On the other hand, in the connection string, there is a syntax for named instance, like “instance=your_instance“.

What you’ll have to do to connect to a named instance is not putting the instance name in the server name, like ADANEASA-RO/SQLEXPRESS, but concatenate everything in the port field.
Your port should be like [PORT]/[DB_NAME];INSTANCE=[INSTANCE_NAME]

Good luck!

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