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  1. #1
    Join Date
    Oct 2012

    ORA-12537 TNS connection refused

    dear friends,

    I have a strange behaviur when I try to connect to the database, maybe you can help me.

    I have Oracle 11. When I try to connect from a client to the database DUC I am getting error ORA-12537 TNS connection refused.

    On DUC I have the client's hostname introduced in sqlnet.ora file. After I reload the listener DUC the connection works. After a time the connection does not work anymore even if I did not made any changes to listener relevant files. A reload always fixes the error.
    Can you please tell me what could be the reason for this and how can I solve this issue?

    Kind regards,

  2. #2
    Join Date
    Mar 2007
    Ft. Lauderdale, FL
    ... is it "refused" or "closed"?

    What do you see on listener's log file?
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

  3. #3
    Join Date
    Nov 2000
    Pittsburgh, PA
    Is the listener crashing?
    this space intentionally left blank

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