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ORA-12541: TNS:no listener

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  • ORA-12541: TNS:no listener

    When connecting to an Oracle database from Navicat on OS X, I receive the following error, "Connection failed. ORA-12541: TNS:no listener".

    From what I have read online this may be due to a local issue with the client listener not running. I have verified with a co-worker that they are able to connect through their client (Navicat for Windows). Up until several weeks ago this was working fine and I was able to connect to the database. Any troubleshooting steps that I could try?

  • #2
    For the error ORA-12541, please try to refer to -


    • #3
      Tried everything under the sun. Updated Navigat, verified the port, the username and password. Nothing seems to be working. I will have to find a workaround somehow.


      • #4
        Could you please provide us the connection settings in your co-worker's Navicat Windows version and in your Navicat Mac version? Right-click the connection and choose Connection Information > Copy to clipboard

        Please send the information to our support center -