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This is a know issue, you need to apply one patch. Please find the below metalink id's which will help you to resolve the issue.
All deployed application in in Enterprise Manager showed as STATUS DOWN (red down arrow) [ID 1511157.1]
Em Showing Everything Is Down Including The Admin Server Even Though They Are Up [ID 1484381.1]
This is internal Bug 13826887: FAEDG-RUP2:EM IS NOT SHOWING ANY METRICS
Mark if this helps you.