ORA-12541: TNS: no listener
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  1. #1
    Join Date
    Oct 2001
    Posts
    13

    Question

    Does anybody know what can cause this error message (ORA-12541: TNS: no listener)? The only answer I find in all Oracle books (Net8 Administrator's Guide, etc.) is check your listener if it's started & try your test again. My listener is started (WinNT-Services).
    What I am trying to do is to configure a net service name so I can use my OEM. So, I use Net8 Configuration Assistant, enter all the needed parameters (they are consistent with my TSNNAMES.ORA & LISTENER.ORA) - when I choose to perform a test I get this error message.
    I also performed a loopback test through Net8 Assistant as they suggest in Net8 Administrator's Guide - I get the same error.
    Please somebody help me with this issue - I've been trying everything. I uninstalled Oracle 8.1.6 & installed 8.1.7 - same result.

    Thanks for your help!

  2. #2
    Join Date
    Sep 2001
    Location
    NJ, USA
    Posts
    1,287
    1. Compare text Listener.ora and tnsnames.ora files.
    They place in:
    $ORACLE_HOME/network/admin - directory
    and
    they should be something like this:

    ---------------- LISTRNER.ORA ----------------------------
    LISTENER =
    (DESCRIPTION_LIST =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = YOUR_HOST_NAME or IP ADDRESS)(PORT = 1521))
    )
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
    )
    )
    )

    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (SID_NAME = PLSExtProc)
    (ORACLE_HOME = c:\orant)
    (PROGRAM = extproc)
    )
    (SID_DESC =
    (GLOBAL_DBNAME = YOUR_HOST_NAME or IP ADDRESS)
    (ORACLE_HOME = c:\orant)
    (SID_NAME = YOUR_SID)
    )
    )

    check is correct : YOUR_HOST_NAME or IP ADDRESS
    check is correct : YOUR_SID

    ---------------- TNSNAMES.ORA ----------------------------

    YOUR_SERVICE_NAME =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = YOUR_HOST_NAME or IP ADDRESS)(PORT = 1521))
    )
    (CONNECT_DATA =
    (SID_NAME = YOUR_SID)
    # or
    # (SERVICE_NAME = YOUR_SERVICE_NAME)

    )
    )

    EXTPROC_CONNECTION_DATA =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
    )
    (CONNECT_DATA =
    (SID = PLSExtProc)
    (PRESENTATION = RO)
    )
    )

    check is correct : YOUR_SERVICE_NAME
    check is correct : YOUR_HOST_NAME or IP ADDRESS
    check is correct : YOUR_SID
    -----------------------------------------------------------
    if need then correct your parameters.

    2. Check haw work LISTENER manually:

    - open command prompt window
    - enter command:

    lsnrctl
    ..
    > status
    check is status correct and then:

    > reload (if you change any parameter in listener.ora)

    you can do simple:

    > stop
    > start
    > status

    ...
    > exit

    3. check sqlnet connection:

    in command line prompt: tnsping YOUR_SERVICE_NAME
    if you have any domain name then check file
    sqlnet.ora

    for example:
    NAMES.DEFAULT_DOMAIN = YUOR.DOMAIN
    NAMES.DIRECTORY_PATH= (TNSNAMES)

    ------------------------------------------------------
    Good luck! Olga K.















  3. #3
    Join Date
    Dec 2000
    Location
    Virginia, USA
    Posts
    455
    You ahve more then one tnsnames.ora file, Make sure in all of your Tnsnames.ora file have the entry of the instance you are trying to connect.

  4. #4
    Join Date
    Aug 2001
    Location
    Waterloo, On
    Posts
    547
    Shestakov has given the correct solution. Here is an excerpt from the Oracle Documentation:
    TNS-12541 TNS:no listener

    Cause: The connection request could not be completed because the listener is not running.

    Action: Ensure that the supplied destination address matches one of the addresses used by the listener. Compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to go by way of an Interchange). Start the listener on the remote machine.


    Raminder Singh

    Oracle Certified DBA: Oracle 8i, 9i


    Mail me at raminderahluwalia@rediffmail.com.

  5. #5
    Join Date
    Oct 2001
    Posts
    13

    Question

    DEAR FRIEND MR.Shestakov,

    THANKS AGAIN FOR ALL YOUR INPUT.
    1) I ALREADY MADE SURE THAT BOTH OF THESE FILES ARE CONSISTENT WITH EACH OTHER: BOTH OF THEM HAVE ACCURATE - YOUR_SERVICE_NAME, YOUR_HOST_NAME, IP ADDRESS, YOUR_SID.
    2) THE ONLY THING IS - ONE OF THEM (I CAN'T REMEMBER NOW WHICH ONE) HAS 2 SEPARATE ENTRIES: ONE FOR PORT 1521 & ANOTHER ONE FOR SOME OTHER PORT.
    3) I MANUALLY CHECKED, STOPPED & STARTED AGAIN MY LISTENER. STATUS CHECK "WENT WELL" TOO.
    4) WHEN I DO: tnsping YOUR_SERVICE_NAME - I GET THE SAME ERROR MESSAGE BUT WITH TNS- PREFIX (TNS-12541).
    BUT I AM ABLE TO : PING YOUR_HOST.
    5) SQLNET.ORA: AT SOME POINT WHEN I WAS TRYING SOME UTILITIES THEY SUGGEST IN NET8 ADMIN'S GUIDE - I HAD ORACLE ERROR MESSAGES ABOUT THIS FILE:

    NNL-00024: WARNING: NO PREFERRED NAME SERVERS IN SQLNET.ORA
    NNL-00018: WARNING: COULD NOT CONTACT DEFAULT NAME SERVER.

    SO I LOOKED AT THAT FILE - IT ONLY HAS 2 GENERIC LINES OF CODE IN IT & NONE OF THEM HAS ANY SPECIFIC NAMES OR MY PC PARAMETERS. AND I AM NOT SURE WHAT IS SUPPOSED TO BE IN IT.

    CAN YOU HELP?

    THANKS A LOT!

    OLGA.

  6. #6
    Join Date
    Sep 2001
    Posts
    10
    Are you doing the TNSPING on that machine or a client machine? If it is a client machine, is the tnsnames.ora up do date with the correct information, IP of the server that the Oracle is listening on?

    Often I've seen this error caused by machines with 2 NIC's where the listener is listening on one IP and the tnsnames.ora is pointing to the hostname of the machine (which is not the correct IP for the listener).

    And does anyone know how to turn of the centering for all these messages?

  7. #7
    Join Date
    Sep 2001
    Location
    NJ, USA
    Posts
    1,287
    OK, it's good.

    Then we try to check default domain information in sqlnet.ora and init.ora files.

    In file SQLNET.ORA check following lines:

    NAMES.DEFAULT_DOMAIN = your.domain
    # for example org_name.com

    NAMES.DIRECTORY_PATH= (tnsnames, onames, hostname)

    and check in init.ora, tnsnames.ora, listener.ora:

    ------- INIT.ORA ----------------
    You have something like this:

    db_name = "YOUR_DB"
    db_domain = your.domain.com
    instance_name = YOUR_SID
    service_names = YOUR_SID.your.domain

    --------- TNSNAMES.ora ------------------
    ...
    (service_name = YOUR_SID.your.domain)
    ...
    # full service name

    NOTE: try setup full entry name:

    YOUR_ENTRY.your.domain =
    ( DESCRIPTION = ...

    ----------------------------------------------------
    May be try to check IP_ADDRESS directly in:
    ... (ADDRESS = (PROTOCOL = TCP)(HOST = 111.222.333.444 )(PORT = 1521))
    if you know it.
    ----------------------------------------------------

    after each correction try execute TNSPING your_entry and
    TNSPING your_entry.your.domain

  8. #8
    Join Date
    Oct 2000
    Location
    Saskatoon, SK, Canada
    Posts
    3,925
    could you post the tnsnames.ora and listener.ora and sqlnet.ora files. Remember to mask any IP/Hostname information. Please leave the port information as it is....

    Looking forward to see... BTW, may I know the relase date for this 8.1.7 package...

    Sam
    Thanx
    Sam



    Life is a journey, not a destination!


  9. #9
    Join Date
    Oct 2001
    Posts
    13

    Question

    I think my problem is in sqlnet.ora. It only has 2 lines in it:

    NAMES.DEFAULT_DOMAIN = your.domain
    NAMES.DIRECTORY_PATH= (tnsnames, onames, hostname)

    just exactly the way they are typed in above. It seems to me that I need to change it - but I was not sure what to use for tnsnames & onames.

  10. #10
    Join Date
    Oct 2001
    Posts
    13

    Question

    I will post my tnsnames.ora & listener.ora & sqlnet.ora files tomorrow. I will have access to that machine only tonight.

    Thanks,
    Olga.

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