Enterprise Manager 10.2.0.5 is not able to connect to the database instance

This error may have a variety of causes, and this is how I fixed it:

1. Dropped old Database Console

$ emca -deconfig dbcontrol db

2. Recreated Database Console

$ emca -config dbcontrol db

In the above step, the operation log ended up with:

SEVERE: Error starting Database Control
CONFIG: Stack Trace:
oracle.sysman.emcp.exception.EMConfigException: Error starting Database Control
at oracle.sysman.emcp.EMDBPostConfig.performConfiguration(EMDBPostConfig.java:649)
at oracle.sysman.emcp.EMDBPostConfig.invoke(EMDBPostConfig.java:227)
at oracle.sysman.emcp.EMDBPostConfig.invoke(EMDBPostConfig.java:196)
at oracle.sysman.emcp.EMConfig.perform(EMConfig.java:184)
at oracle.sysman.emcp.EMConfigAssistant.invokeEMCA(EMConfigAssistant.java:494)
at oracle.sysman.emcp.EMConfigAssistant.performConfiguration(EMConfigAssistant.java:1161)
at oracle.sysman.emcp.EMConfigAssistant.statusMain(EMConfigAssistant.java:478)
at oracle.sysman.emcp.EMConfigAssistant.main(EMConfigAssistant.java:426)

After having repeated steps 1 and 2 a couple of times, checked environment variables were correctly set and checked users SYS, DBSNMP and SYSMAN were not locked, I started looking for this issue in oracle forums and I found the following:

https://forums.oracle.com/forums/thread.jspa?threadID=2173463

The root certificate used to secure communications via the Secure Socket Layer (SSL) protocol expires on 31-Dec-2010 00:00:00O , so If you try to configure Database Console after that date the certificate will cause errors.

Luckyly, Oracle released patch 8350262 which solves this issue.

3. So the obviously following step is to apply patch 8350262 which doesn’t need to put the database offline. Just check the provided README.txt from the patch zip file and you’ll be safe.

4. Repeat steps 1 and 2 again, and your OEM will be up this time :)

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