Friday, 21 June 2013

Listener Fails to start TNS-12557,12560,00527 , ORA-12547: TNS:lost contact -- Windows Environment

We have faced very wired issue with Oracle database 11g Listener in Windows environment. For some reason 
it's not starting up and giving  following errors. We have tried all the solutions to resolve this issue, like starting/stopping listener through different Oracle Home, configuring timeout in sqlnet.ora , amending hosts files,creating another listener through netca , even try installing new oracle client with different ORACLE_HOME, but none of this solutions helped. 

But one thing i forget to mentioned here , we have also got another Oracle product on same machine.

WEBLOGIC  10.3.3

It mean Our Windows Registry have some many key/value for the Oracle product. And we didn't have any clue what was causing problem.

But at last we tried one very simple thing and it works. That I have mentioned in Solution part. 

And guess what , it works !! 

And therefor I guess, one good Oracle DBA hates Windows for their databases.


TNSListener fails to startup.

Errors include

ORA-12547: TNS:lost contact
TNS-12557: TNS:protocol adapter not loadable
TNS-12560: TNS:protocol adapter error
TNS-527: Protocol Adapter not loadable

Also seen with
Failed to start service, error 997.
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error


Remove the ORACLE_HOME system environment variable.
From Start button, navigate to Control Panel.  Then select the System icon and click the Advanced tab.
Click the Environment Variables button
Find the ORACLE_HOME in the system environment variables and delete it.
Re-boot the machine.

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