EM 11g or EM 12c Using Virtual Hostname : Backend WLS or EM Application Seems to Be Down When Accessing Console URL of Second Physical OMS (Doc ID 1327864.1)

Last updated on OCTOBER 01, 2015

Applies to:

Enterprise Manager Base Platform - Version 11.1.0.1 to 12.1.0.1.0 [Release 11.1 to 12.1]
Information in this document applies to any platform.

Symptoms

The issue happens with EM Grid Control 11g or EM Cloud Control 12c.

The OMS installed with Virtual hostname and two physical hosts behind the virtual host

Configuration:
Two OMSs associated with a virtual hostname and virtual ip.
The vip can be started on any of the servers in case of failure of one server.

Physical hostname Server 1 - <physical_hostname1>
Physical hostname Server 2 - <physical_hostname2>
Virtual Hostname (with virtual IP) - <virtual_hostname>

Symptoms

The console URL works for https://<physical_hostname1>:1159/em
The  console URL works for https://<virtual_hostname>:1159/em
The console URL does not work for the second additional OMS server https://<physical_hostname2>:1159/em.
The URL with the second physical hostname is no longer accessible.
It gives the error message.

"Backend WLS or EM application seems to be down"

+ The issue could happen after an upgrade from one EM version to an another version. But this is not the only case where the issue happens.

Cause

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