Unable to log into newly installed 10.7 CEM

Document ID : KB000123152
Last Modified Date : 18/12/2018
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Issue:
Trying to access the CEM interface and you get this message.
 
Receiving the following: HTTP ERROR: 503
Problem accessing /wily/cem/tess/app/login.html.
Reason: SERVICE_UNAVAILABLE

This was a new install of the Enterprise Manager.
Environment:
10.7 APM/CEM
Resolution:
1. Stop the Enterprise Manager
2. Delete the userCache.dat file in /tmp folder
3. restart the EM