HI,
I have one single SCOM 2012 R2 and about 100 Agents. After automatic update with .net framework updates for September the Server stopped working. It gave me an error "Error 20022 - All Management Servers Resource Pool not heartbeating" in the eventlog and no Client was able to Report to the Server. The only Event in the SCOM Console was the "All Management Servers Resource Pool". If I closed it, it came back. After Reboot, the machine began to work for short time. Then a Monitoringhost.exe process began to get all Memory. The machine slowed down and was not useable and stopped nearly working. I killed the process, rebooted and nothing worked anymore. I uninstalled .net updates and after reboot the machine started to work again for a week. Now after one week, the .net updates were installed by automatic update again, my fault. The same Problems came back, but this time uninstalling the updates did not help. After reboot I get the Error 20022 for several ids and the agents can not report to the Server. If I close an old Event, I get no notification.
Any ideas?