After I stopped all the BM and Surfcontrol Services, I changed the Volume
settings on this server. After bringing up the BM again, it Proxy did work
fine, but the Surfcontrol Rules I was not able to change anymore.

Now everytime I say ok in the NWADMIN32/ACCESS RULES the error shows
up "Not able to write to file" and stops. CPFilter.nlm is loaded.
I tried to install the Surfcontrol new, but the same problem appears again.

Does anybody know, how to make that Surfcontrol to work again? The Logs
are fine, just the NWADMIN seems to have a problem with it. We do have
enough memory in the Server (2GB) and also restart of the Server would not
help me either.
Thanks in advance for helping me out here.