SCOM Event ID 20070 on Clients and Event ID 21037 on Management Server

From time to time I found hosts in a grey status where it was hard to determine what was the issue.
I spend hours googling error codes, reading through MS forums, removing and installing agents, clearing HealthState folders – nothing did help.

– Health state is shown as grey.
– Event ID 20070 on Client.
– Event ID 21037 on Management Server.
– No hosts shown in “pending management” approval view.

This can happen due to DNS suffix not configured correctly.
Go to “System Properties” click on “change”. Click on “More…”.
Enter a DNS suffix and reboot the server.
Agent health state should be green in SCOM again.

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