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Error starting OMS service

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I got an error when I tried to start OMS.

testes.localdomain {} /oms12cr2 > emctl start oms
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation.  All rights reserved.
Starting Oracle Management Server...
Starting WebTier...
WebTier Successfully Started
Oracle Management Server is not functioning because of the following reason:
Connection to the repository failed. Verify that the repository connection information provided is correct.

Bash

The SYSMAN password was changed directly in the database, instead of being changed correctly via emctl.

testes.localdomain {OEMCP1} /ora11g/app/product/11.2.0.3/OEMCP1/bin > emctl config oms -change_repos_pwd -use_sys_pwd -sys_pwd teste123 -new_pwd testedragao
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation.  All rights reserved.

Changing passwords in backend ...
Passwords changed in backend successfully.
Updating repository password in Credential Store...
Successfully updated Repository password in Credential Store.
Restart all the OMSs using 'emctl stop oms -all' and 'emctl start oms'.
Successfully changed repository password.

Bash

After the change, we stopped the service (if it was live, which I wasn’t) and started the service again. The SYSMAN password was changed directly in the database, instead of being changed correctly via emctl.

testes.localdomain {OEMCP1} /ora11g/app/product/11.2.0.3/OEMCP1/bin > emctl stop oms -all; emctl start oms
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation.  All rights reserved.
Stopping WebTier...
WebTier Successfully Stopped
Stopping Oracle Management Server...
Oracle Management Server Successfully Stopped
AdminServer Successfully Stopped
Oracle Management Server is Down
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation.  All rights reserved.
Starting Oracle Management Server...
Starting WebTier...
WebTier Successfully Started
Oracle Management Server Successfully Started
Oracle Management Server is Up