The Network Adapter could not establish the connection when connecting with Oracle DB

Question

When trying to connect with a remote Oracle database via JDBC I receive the following exception:

java.sql.SQLRecoverableException: IO-fout: The Network Adapt         


        

Answer 1

I had similar problem before. But this was resolved when I started using hostname instead of IP address in my connection string.

Answer 2

If it is on a Linux box, I would suggest you add the database IP name and IP resolution to the /etc/hosts.

I have the same error and when we do the above, it works fine.

Answer 3

When a client connects to an Oracle server, it first connnects to the Oracle listener service. It often redirects the client to another port. So the client has to open another connection on a different port, which is blocked by the firewall.

So you might in fact have encountered a firewall problem due to Oracle port redirection. It should be possible to diagnose it with a network monitor on the client machine or with the firewall management software on the firewall.

Answer 4

Take a look at this post on Java Ranch:

http://www.coderanch.com/t/300287/JDBC/java/Io-Exception-Network-Adapter-could

"The solution for my "Io exception: The Network Adapter could not establish the connection" exception was to replace the IP of the database server to the DNS name."