Coskan’s Approach to Oracle

April 19, 2007

Io Exception: the network adapter could not establish the connection (Enterprise Manager)

Filed under: Diary, Tips — coskan @ 12:31 pm

Yesterday I gave my decision to upgrade my 10G OCA certificate to OCP. For preperation I need an EE or PE 10G database and I have two database installed (XE and EE (SID= ORACOS) )on my Windows XP Pro Machine. The installation order was first XE next EE and after installation I configured the listener of with another port rather than 1521 because of the port conflicts. Moreover I configure the listener start from the XE home and I didn’t configure EM for database from the installation till today.

When I need EE what i did is firts I changed the ORACLE_HOME to home from XE home and I changed the ORACLE_SID to ORACOS then I started EM with

>emctl start

Enterprise manager started but when I went to EM page database status was unavailable and needs recovery.

I said recover database and this button took me the host and database credential entry page. I gave local administrator for host and sys for database unfortunately I took the error “RemoteOperationException: ERROR: Wrong password for user”. I changed the password for the local administrator bu nothing has changed after googling I found a solution at an orafaq forum thread . The solution is below and worked well and took me to the next trouble 🙂
Solution for “RemoteOperationException: ERROR: Wrong password for user” error :

If you are on windows: Go to Control Panel–>Administrative Tools–>Local Security Policy–>Local Policies–>User Rights Assignment–>U will see in the policy as “Log on as a batch Job–>right click–>Properties–>add user or groups–>give your OS username.

The next trouble was Io exception: The Network Adapter could not establish the connection”

I checked the listener_oracos it was working well. For a try I restarted both dbconsole and listener but the error was there again. What could be the problem ?

Here comes the solution from the survivor Metalink. Note:273758.1 . The problem is that I did a default installation for database and made changes to default listener configuration but I did not reflect it to other hard coded configuration files such as enterprise manager config files.

To solve the problem I change the default entries (oracle_listener,Port,LsnrName,ListenerOraDir ) on the file ORACLE_HOME/hostname_sid/sysman/emd/targets.xml and port entries for the parameter oracle.sysman.eml.mntr.emdRepPort, oracle.sysman.eml.mntr.emdRepConnectDescriptor on the file ORACLE_HOME/hostname_sid/sysman/config/

and restart the dbconsole. Guess what happened ? I started to sing the song “Yesterday All my troubles seems so far away …..”

Moral of the story; If you make a configuration change, reflect the change to all of the files related with your change.

Now it is time to prepare for OCP exam. I hope In 2-3 weeks time i will take the exam and will write the interesting OCP topics here.


  1. thanks a lot

    Comment by Gagik Antonyan — November 19, 2007 @ 12:53 pm

  2. Thank you, very much!
    I singing…

    Comment by Баярсайхан — January 14, 2008 @ 11:20 am

  3. Thank you!!! I had changed the targets.xml file but not the

    I am testing an upgrade from 9i to 10g and its not going as easily as i though…..

    Comment by ashaman25 — March 6, 2008 @ 12:02 pm

  4. Hi,
    No words to thanks you. I was struggling from last 5-6 hrs and after reading ur article I just changed my /etc/hosts file to reflect the new machine IP and problem solved.
    Thanks a lot.

    Comment by Neeta — March 28, 2008 @ 8:25 am

  5. Doesn’t have any idea.. could you help me. I’s still confused..

    Comment by Ndie_yach.. — April 3, 2008 @ 7:17 am

  6. I ran into this problem on my laptop running 10g. I did a cold-reboot and my DB came up fine. I think there was a problem with the network adapter not resetting correctly.

    Comment by Paul — April 19, 2008 @ 2:11 pm

  7. Thanks a lot for a hint 🙂 I’ve had the same problem – and now it solved.

    Comment by Alex — May 27, 2008 @ 1:45 pm

  8. Hi,
    We had a similar problem. We renewed our IP and then everything worked fine. Goto command prompt and type “ipconfig /renew”


    Comment by Uma — June 11, 2008 @ 1:11 pm

  9. i want to run jdeveloper …. when i was trying to establish database connection ..i got connection cannot be established
    (io exception)

    Comment by saileshan — June 20, 2008 @ 5:08 pm

  10. Hi
    I am new in JSP. I have devlope one page but i am trouble becouse of following error can you help me to solve this problem.

    Error : Io exception: The Network Adapter could not establish the connection

    Thanks in addvance

    Comment by Nitin — July 23, 2008 @ 6:21 am

  11. thanks a lot!!

    For “Io exception: The Network Adapter could not establish the connection” – I did exactly what you have described here

    made changes in listener.ora and did not relfect those changes elsewhere in harcoded configuration


    Comment by Paras Jethwani — August 21, 2008 @ 1:55 am

  12. SEVERE: Io exception: The Network Adapter could not establish the connection

    Comment by Ramesh Babu — August 22, 2008 @ 6:10 am

  13. I’m signing and dancing a jig too! I missed the file too! Thanks!

    Comment by capena — January 20, 2009 @ 9:14 pm

  14. […] teve jeito, precisei buscar ajuda especializada. Não encontrei ainda nenhum FIX ou recomendação no Metalink para este problema. Ocorre que para […]

    Pingback by Como resolver problemas de Credenciais de Host com Oracle 10g e 11g no Windows 2003 Server | BRQTec - Conhecimento, Tecnologia e Experiência de Negócio » — April 3, 2009 @ 11:21 pm

  15. Hi

    Thanks for the Info


    Comment by Basu — July 17, 2009 @ 7:25 am

  16. Coskan Rocks! Thank you very much for this indeed.

    Comment by darkdwarf_DBA — January 21, 2010 @ 6:38 pm

  17. I seems your Problem from listener,
    I have same thing and by:
    lsnrctl relaod , solved

    Comment by khalid — April 28, 2010 @ 8:13 am

  18. I song toooooooo >>>>> thanks alot

    Comment by Mohammed yaghi — May 17, 2010 @ 3:47 pm

  19. If you make a configuration change, reflect the change to all of the files related with your change.

    -great tip! I wish I’d learned that one sooner.

    Comment by online java training — August 4, 2010 @ 11:50 pm

  20. really helpful~~ thanks

    Comment by bin — January 15, 2011 @ 9:07 am

  21. guz plz help me i have same error netwrk adapter one ,,,shud i install 10g db cuz i m using 9i shud i change port no plz help me soon thanx…

    Comment by nikunj — April 6, 2011 @ 2:32 pm

  22. Thanx a lot … really thankful..

    Comment by java training — April 8, 2011 @ 6:16 pm

  23. hi all i am not finding target.xml file in my system.. and when i checked the file with an other working system , i dont find any difference file looks fine..

    Comment by ashwin kumar — July 26, 2011 @ 10:37 am

  24. how to open $ is oen thourgh cmd/sqlcmd.?

    Comment by paras — August 16, 2011 @ 11:26 am

  25. other solution :
    you make sure that you have the right DNS on your IP Address this is happened if you have 2 network

    Good luck

    Comment by sinan — November 22, 2011 @ 8:35 am

  26. im sorry.. i am new to oracle.. can u guide me step by step? where to find the oracle_home path?

    thank you 🙂

    Comment by ena — June 16, 2012 @ 4:15 am

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