SCOM 2012 R2 # Windows Server agents remain in pending management

Question

Hi,
First I installed one SCOM 2012 R2 Ops Manager. On same SCOM ops manager I added 3 windows server agents to monitor as below..
one 2008 R2 AD server
one Lync 2013 FE server
one Exchange server 2013
Now due to some technical issues later I had to completely remove/uninstall SCOM 2012 R2 setup. But I forgot to uninstall/remove 3 agents first before uninstalling SCOM 2012 R2 ops manager :( However I did manual uninstall of Microsoft monitoring agent setup
from all 3 monitored agent servers.
Now I setup new SCOM 2012 R2 ops manager once again. FQDN of new SCOM has been changed now, though server is in same domain as old one. Problem I am facing here is " I cannot able to add those 3 agents back into new SCOM ops manager. When I install
agent back onto those 3 servers (by agent discovery or manual setup) , servers remains in pending management. I used power shell command to approve all 3 but even after approval servers are not being monitored. Health status always showing not monitored. A
blank green circle.
I think I didn't properly removed old agent setup, & somehow those 3 agents still bound to old SCOM ops manager.
Could you please help me how I can remove remaining components of old agent setup from windows agent servers and monitor them with new SCOM?
BR,
Ajit

Answer 1

Ensure that the following registry keys are deleted:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Operations Manager
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HealthService
Reboot the agent machine (if possible)
Delete the agent from Agent Managed in the OpsMgr console.
Then try to discovery and push agent from console if failed. Try to install it manual and then from pending management click approved.
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