Pavan DBA's Blog

The DBA Knowledge Store

How to resolve TNS:Connection closed error?

Posted by Pavan DBA on April 25, 2012

Today I faced some issue regarding listener startup and want to share this info with you folks…

I got an email from users saying they are unable to connect to one of the production server. They are getting “NO LISTENER” message. So, its clear from this that listener could have been shutdown.

I logged in and checked the listener status using both “lsnrctl status” command and “ps -ef | grep tns” command. Both of the commands didn’t given any posivitive result.

So I started the listener with the below command and got error as this…

[oracle@dbserver1 admin]$ lsnrctl start LISTENER
LSNRCTL for Linux: Version – Production on 25-APR-2012 18:16:24
Copyright (c) 1991, 2005, Oracle.  All rights reserved.
Starting /u01/ora10g/bin/tnslsnr: please wait…
TNS-12537: TNS:connection closed
 TNS-12560: TNS:protocol adapter error
  TNS-00507: Connection closed
   Linux Error: 29: Illegal seek

The problem is identified as a line is missing in /etc/hosts file (mine is a Linux server). I added below line and problem solved         localhost.localdomain       localhost

So, whenever you hit with the above error (Illegal Seek), please check hosts file and add the above line which will solve the issue……

9 Responses to “How to resolve TNS:Connection closed error?”

  1. Sergio Carvalho said

    Thanks a Lot! It worked for me too…

  2. Kanchan said

    Thanks.worked for me !!!

  3. Dilip (Kanna) said

    Pavan –

    One of our servers got restarted. We already had below entry in /etc/hosts file. localhost.localdomain localhost

    Yet the listener failed to come up with the error mentioned in the post.

    I had to do “export LD_BIND_NOW=1” and then restart the listener. Just in case anybody else faces this issue.

    Thanks –

  4. Aneel Ahmed said

    Thanks a lot; it really helped….

  5. afsar said

    thtanks brothter

  6. Mohammad Shadab Ashraf said

    Great… Thanks for sharing

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