Management Agent Cannot Manage the Application Server on Unix
Ensure that you have installed the Management Agent with the same user and group as the Application Server. Use a directory listing to confirm that this is the case.
For example, this listing illustrates that the Management Agent was installed with
user=oracle
and group=oinstall
:

If the Management Agent is not installed as the correct user or group, use the
chown
command to change the owner or group of the Management Agent. For example:
chown R oracle:oinstall /u02/JDE_HOME