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
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