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VMM 2012 Cluster Troubleshooting: Error 441 - Agent Communication is blocked

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Sometimes Hyper-v host managed by VMM is working fine and suddenly you see host report that "VMM is not able to refresh VMs placed on that host"

http://fawzi.files.wordpress.com/2012/06/captureq_thumb.png?w=583&h=221

In case that you have VMM Cluster you have to make sure that both nodes has WinRM Service configured correctly and the same in all Hyper-v hosts. In this case the Second node in VMM Cluster the WinRM service was not configured. Simple run command WinRM Quickconfig and all errors disappear