All of the devices on one of our subscriber servers unregistered, windows tack manager showed that the CPU had maxed out and the event logs showed the following message.
Error: File /ccmadmin/_RemoteScripts/rs_device.asp Script Engine Exception. A ScriptEngine threw expection 'C0000005' in 'IActiveScriptParse::ParseScriptText()' from 'CActiveScriptEngine::AddScriptlet()'..
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After rebooting the server all services were restored.