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

and

ERROR main: nmectla_agentctl: Error connecting to

First you need to make sure that the link in emd.properties 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
localtime

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