Unable to manage DFS namespace from DFS MMC

Error: The namespace cannot be queried. The specified domain either does not exist.

Hi,

I have an issue with DFS at our site. It has been working fine for years, but recently
the ability to manage it using the DFS MMC no longer works. DFS is still working for
the users fine and I can map to it manually, but the MMC tool no longer connects. I can create
new namespaces fine though.

The error is:

" The namespace cannot be queried. The specified domain either does not exist or could not be contacted. "

I can't risk recreating the namespace due to the impact on users, so anyone have any idea to fix this?

Many thanks

DB