I've got a very large Windows 2000 file server that its backup has been running for quite some time.  I noticed it was stuck at 427GB and not increasing all day.  I examined the log and sure enough found the line "2010-03-14 05:05:02 avtar Error <5237>: Connection killed."

I went in my activity screen, right click and cancel activity.  The activity cancelled but any new backups I try to kick off fail instantly.

2010-03-15 15:22:08 avtar Info <5586>: Loading cache files from f:\Program Files\avs\var
2010-03-15 15:22:08 avtar Error <5064>: Cannot open file "f:\Program Files\avs\var\f_cache.dat"
2010-03-15 15:22:08 avtar Info <7324>: Volume Type for "f:\" is "NTFS", Supports Compression=1, Encryption=1, ACLS=1, DataStreams=1, Reparse=1, Sparse=1
2010-03-15 15:22:08 avtar Info <5065>: Creating new cache file f:\Program Files\avs\var\f_cache.dat (2,884,128 bytes)
2010-03-15 15:22:08 avtar Error <5803>: Error writing 32-byte header to cache file f:\Program Files\avs\var\f_cache.dat.  Possibly out of disk space
2010-03-15 15:22:08 avtar Info <5573>: - Loaded cache file f:\Program Files\avs\var\f_cache.dat (2,884,128 bytes)
2010-03-15 15:22:08 avtar FATAL <5223>: Unable to open filename cache in directory 'f:\Program Files\avs\var'

I logged into the server and show the Avatar program in the tray, flashing away like it's still backing up.  It's stuck on the same file the activity log showed on the backup I cancelled.  Now I am administrator on this server and I tried to kill the avtar.exe process to hopefully restart it, without restarting the server, but all I get is an access denied message on the process.  I've stopped and started the service with no luck.

Is a reboot of the server the only option?

Thanks,

Joe