Troubleshooting Migration compatibility error: The operation is not allowed in the current state

When performing a VMotion migration the following compatibility error is displayed:

Unable to migrate from <source server> to <destination server>: The operation is not allowed in the current state .

This unable to migrate error message occurs because the ESX Server is in an unexpected state.

This error typically appears when the server is in the progress of entering maintenance mode.

To workaround the issue, perform one of the following:

Cancel the Enter maintenance mode task from the Virtual Infrastructure Client.
Wait until any pending tasks for the ESX Server are complete.
Disconnect and then reconnect the ESX Server to VirtualCenter and restart the VMware VirtualCenter Server service.

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