Discoverer shows down in Grid Control while up.
Short one this time, all in favour of getting my green ‘pie’ in Grid Control management server.
Grid Control: 10.2.0.5. Discoverer: 10.1.2.x
In Grid Control, after upgrade to 10.2.0.5, a Discoverer target shows down in the list, while it’s functioning quite well.
It seemed an old bug (Grid Ctrl 10.1.04) is still not fixed:
- Bug 4474849 / 3897834 ‘DISCOVERER INSTANCES ALWAYS SHOW DOWN’
- Note: 332363.1
Solution:
1- Remove the Application Server target which owns the Discoverer component (10.1.2) in the Grid Control
2- Stop the agent
3- Backup the file %CENTRAL_AGENT_ORACLE_HOME%/sysman/admin/metadata/oracle_discoverer.xml file.
Replace this file by:
%BI_ORACLE_HOME%/sysman/admin/metadata/oracle_discoverer.xml file
BI_ORACLE_HOME corresponds to the Oracle_Home where Discoverer 10.1.2 is installed.
4- Restart the agent
5- Rediscover the Application Server target on the host, by typing (Agent-environment) ‘agentca -d’.

I have identical issue i.e GC still shows Discoverer is “status pending” and hence MidTier as down in GC where as everything is UP in AS console right on the machine. I did exactly all steps per 332363.1 In fact I had to go 1 step forward..I have a firewall between GC host and AS..so when I want to upload AS, I had to request FW security person to allow non-SSL communication in order to allow ‘emctl secure agent’ command to go through successfully. The oracle_discover.xml file is identical on both GC as well as AS but at the end; no change! i.e. Discoverer is shown “status pending” and hence the midtier down!