If you ever have any trouble with UNIX/Linux Agent Discovery in System Center 2012 Operations Manager (OpsMgr 2012) then the article below is a great place to start. And, since it’s on our TechNet Wiki site, if you have any tips you’d like to share you’re encouraged to do so by editing the article directly.
When performed by the Discovery Wizard or PowerShell cmdlets, discovery of UNIX and Linux agents in Operations Manager typically involves three activities:
1) Agent deployment
2) Certificate signing
3) Discovery of the agent
Agent deployment and certificate signing are performed using ssh, but these steps can also be performed
. The final agent discovery is performed using a WS-Management query to the deployed agent. The discovery process may fail due to configuration issues, credential or privilege problems, or network and name resolution problems…
For the complete article please see the following: