File sync never stops

I have moved the (NSS) Home-Dirs of the users to a new volume. The Home-Dir Attrib in eDir is changed. All access to the new Home-Dir volume via NCP and CIFS is fine.

FiLR created a new Netfolder-Server by its own. But I can not delete some of the old Home Netfolders because the syncing process is running there and can not stopped. Maybe this is because the old volume is not reachable anymore.

Any hint how to solve this?