SCOM: "Event Log ID 20070" on managed Computers

Hi,
Today I manually installed SCOM agent on one of my remote servers. After installation when i checked the status of that server it shown me unmanaged. I wait for 1 hours (i thought it may be a communication problem) but the the status was same.

Then i checked the EventLog of managed server and it showing me Event ID 20070  and 21016

which pointing to check the Event Log of the SCOM server and check for Event ID 20000

According to Event ID 20000 , A device which is not a part of this management group has attempted to assess this Health Service .... But this is not true , all my setting , including Management Group Name, Server name is correct.

At this point I have no idea what to do ... Then i did the following ..
I restarted the core services of SCOM server

And after restarting, everything seems fine :)

I hope this helps :)

Thanks

Take care

Aman Dhally