The action ‘Validate Configuration…’ did not complete.

Hi People,
Following error occurs when I try to deploy VNC to a remote computer or when using built-in management tools.
Please help me to solve this issue.
Thanks.

Error
The operation has failed.
The action ‘Validate Configuration…’ did not complete.
Hide detail
The RPC server in unavailable. (Exception from HRESULT: 0x0800706BA)
