Troubleshooting OEM12c,

This  is quite natural  error at the time of configuring oms server / at the time of maintenance of server.

The behavior is something like below.

[oracle@oem12c bin]$./emctl status oms

WebTier is Up

Oracle Management Server is Down

even after we try couple of start/stop operations also, may not helpful in bring the oms up.

$./emctl start oms

Starting WebTier...

WebTier Successfully Started

Starting Oracle Management Server...

Oracle Management Server is Down

In emctl.log we can see the below errors

·         Failed to connect to em login page

·         Encountered error while hitting page. Status codes are 404 for console and 500 for PBS

·         Connection exception when trying to hit OMS page. OMS is down

So all you have to do is, need to follow a sequence to bring it up,

 ·         stop the oms repository forcibly

       emctl stop oms -force

·         Bring the repository database listener first.

·         Check the listener services

       lsncrctl services

·         Next bring the repository database up.

·         Check the connectivity for sysman user from sqlplus,  in case of any problems with the password/account lock resolve them .

·         And then start the oms .

       emctl start oms

Now it's succefully started and you are supposed to get acces to the login page.

Thanks for reading the posting...!