wsus mmc access problem

Hi All

Installed WSUS 3.0 many months ago and work fine !

When I tried to connect yesterday I got the message below:

"Cannot connect to SERVERNAME you do not have the permissions required to
access this WSUS server
To connect to the server you must be a member of the WSUS Administrators or
WSUS reporters security groups."

I'm logged onto the server as a domain admin, I've added domain admins group
to both the WSUS Admin and WSUS Reporters groups on the server so I don't
know where the permission problem could be.

Any idea ?

Thank you !

Hugo