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Event ID: 21051 Source: MicrosoftOperationsManager

The MOM Server failed to retrieve host information corresponding to a host name "<>" from a host database.

Error Code: <error code>
Error Description: <error description>.
From a newsgroup post: "I had the server in Pending actions folder but unfortunately the server left the network for about 4 weeks. When it came back on network I could not install the agent from the Pending actions folder. Removed the server from the pending action folder and used the Install agent wizard (because the discovery rule wont add the server automatically to either Pending actions or Unmanaged anymore). I got this error during agent installation. Resolution: The discovery rule did not add the server again unless I changed the discovery rule (any change) and then changed it back to the original setting".

Also, check ME317010 for additional details.

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