Oracle Enterprise Manager unable to Start

When I checked the log Located $ORACLE_HOME/SID_HOSTNAME/sysman/log

I found the below errors :

app.ContextInitializer contextInitialized.420 – Integration Class not found


ERROR main: nmectla_agentctl: Error connecting to

First you need to make sure that the link in and ports and configured right and hostname is correct, restrat dbconsole if this not works then check the below

On Host :

oracle@TEST:/u01/app/$ echo $TZ

oracle@TEST:/u01/app/$ export TZ=Etc/GMT+2

emctl config agent updateTZ

emctl resetTZ agent 

Restart Dbconsole

Emctl start dbconsole 

 Thank you
Osama mustafa