The article referenced below discusses tips on fixes and changes for Microsoft System Center Operations Manager 2007 (OpsMgr 2007) Agent Health. The article also discusses hotfixes and registry keys. Be aware that these hotfixes and registry keys may not be noticed in your environment directly but might be causing issues of which you are not aware. The article is for Operations Manager 2007 SP1 and Operations Manager 2007 R2. For Operations Manager 2012, Operations Manager 2012 SP1, and Operations Manager 2012 R2 see the following article:

KB2843219 - System Center 2012 Operations Manager: Recommended agent operating system fixes and updates (http://support.microsoft.com/kb/2843219)

If you have an issue that affects agents that are in a gray (grey) state these tips and fixes may help, however if they do not then the following article may be helpful:

KB2288515 - Troubleshooting gray agent states in System Center Operations Manager (http://support.microsoft.com/kb/2288515).

For more details please see the following:

KB2616936 - Agent Health tips and fixes for System Center Operations Manager 2007 (http://support.microsoft.com/kb/2616936)

J.C. Hornbeck | Solution Asset PM | Microsoft GBS Management and Security Division

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System Center All Up: http://blogs.technet.com/b/systemcenter/
System Center – Configuration Manager Support Team blog: http://blogs.technet.com/configurationmgr/
System Center – Data Protection Manager Team blog: http://blogs.technet.com/dpm/
System Center – Orchestrator Support Team blog: http://blogs.technet.com/b/orchestrator/
System Center – Operations Manager Team blog: http://blogs.technet.com/momteam/
System Center – Service Manager Team blog: http://blogs.technet.com/b/servicemanager
System Center – Virtual Machine Manager Team blog: http://blogs.technet.com/scvmm

Windows Intune: http://blogs.technet.com/b/windowsintune/
WSUS Support Team blog: http://blogs.technet.com/sus/
The AD RMS blog: http://blogs.technet.com/b/rmssupp/

App-V Team blog: http://blogs.technet.com/appv/
MED-V Team blog: http://blogs.technet.com/medv/
Server App-V Team blog: http://blogs.technet.com/b/serverappv

The Forefront Endpoint Protection blog : http://blogs.technet.com/b/clientsecurity/
The Forefront Identity Manager blog : http://blogs.msdn.com/b/ms-identity-support/
The Forefront TMG blog: http://blogs.technet.com/b/isablog/
The Forefront UAG blog: http://blogs.technet.com/b/edgeaccessblog/