Fix OEM emctl Error: Backend WLS or EM application seems to be down

Problem Description:

Unable to launch the OEM as it gives error Backend WLS or EM application seems to be down 

Solution Description 

Looks like somewhere it is stuck even though it’s process running on the server. We have to stop all related process and refresh properly. Here is the steps. 

1. Stop the OMS

emctl stop oms -all

2. kill all related OS process.

ps -ef | grep EMGC_ADMINSERVER
ps -ef | grep EMGC_OMS1
ps -ef | grep oms

Kill all the OS processes which list by the above process. 

3. delete all the files under weblogic domain

find . -name "*.lok"
$ find . -name "*.lok"
./gc_inst/user_projects/domains/GCDomain/edit.lok
./gc_inst/user_projects/domains/GCDomain/config/config.lok
./gc_inst/user_projects/domains/GCDomain/config/fmwconfig/ovd/default/ovd.lok
./gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/data/ldap/ldapfiles/EmbeddedLDAP.lok
./gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/tmp/EMGC_OMS1.lok

$ rm ./gc_inst/user_projects/domains/GCDomain/edit.lok ./gc_inst/user_projects/domains/GCDomain/config/config.lok ./gc_inst/user_projects/domains/GCDomain/config/fmwconfig/ovd/default/ovd.lok ./gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/data/ldap/ldapfiles/EmbeddedLDAP.lok ./gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/tmp/EMGC_OMS1.lok

4. Start OMS freshly once again.

emctl start oms