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Fix SQL Developer vendor error 17002

Oracle Tips by Burleson Consulting
December 15,  2008

 

Question:  I was trying to connect to Oracle through SQL developer, and I see this error.

io exception: the network adaptor could not establish the connection
Vendor code 17002

Answer:  In your case the "Vendor code 17002" is the equivalent of the ORA-12541 error:  It's most likely that your listener is down, or has an improper port or service name.  From the docs:

ORA-12541: TNS no listener

Cause: Listener for the source repository has not been started.

Action: Start the Listener on the machine where the source repository resides.

Basically, SQL Developer could not find the listener. First check the tnsnames.ora file and ensure that it points to the correct server and port. If the Forms server is on another machine, test the TNS resolve with tnsping from the command prompt. Finally, check the listener.
# lsnrctl status
This should show the status of the listener and the services it is listening for. Remember that when you run SQL*Plus on the database server, it does not need the listener to connect unless you specify the database tnsnames.ora entry.

You can use the lsnrctl status command to verify that the listener is down, and lsnrctl start to start your listener. If you are on Windows, also verify that the listener service is running. 

 

 

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