Forum Stats

  • 3,872,251 Users
  • 2,266,411 Discussions


Unable to connect to 19c DB through Sql developer

gg Member Posts: 156 Bronze Badge

Hi Everyone,

I installed Oracle 19c Database after installing another one and I am able to connect through command line to db through sql plus.

However i am not able to connect through Sql developer tool. I am getting the error:

Status : Failure -Test failed: IO Error: The Network Adapter could not establish the connection (CONNECTION_ID=z/Q7O7w8TReTjDflkD0i5A==)

I saw the listener has not started yet. So after the checking the listener status i got the error message.


TNS-12541: TNS:no listener

 TNS-12560: TNS:protocol adapter error

 TNS-00511: No listener

  64-bit Windows Error: 61: Unknown error


TNS-12541: TNS:no listener

 TNS-12560: TNS:protocol adapter error

 TNS-00511: No listener

  64-bit Windows Error: 2: No such file or directory

After trying to start the listener, i am getting the error

Failed to start listener service, error 2: The system cannot find the file specified.

TNS-12560: TNS:protocol adapter error

 TNS-00530: Protocol adapter error

I am unable to start the service via Windows services as well.

Could some one please help to resolve this connection issue.





  • EdStevens
    EdStevens Member Posts: 28,778 Gold Crown

    Your question is off-topic for this forum, as it has nothing to do with SQL or PL/SQL. And while your error appears in SQL Dev (which has it's own forum), it appears that SQL Dev is incidental. Better asked in the general database forum.

    If I were sitting at your desk to debug this, I'd first want to see your successful connection with sqlplus, just to confirm exactly where the database is in relation to the client, and exactly what method you are using to connect with sqlplus.

    Next I'd want to see your connection properties in SQL Dev, and confirm you really are pointing to the same database.

    Next, I'd check the listener on the database server. Since you seem to have difficulty starting the listener, I'd want to see the listener.ora file.

  • dvohra21
    dvohra21 Member Posts: 14,689 Gold Crown
    edited Feb 2, 2022 11:55PM

    Are two database services running, or one? Seems like installing the second database on top of the first did not get installed properly. What is the output of

    lsnrctl status