Command line scanning and Exchange exclusions

We are using a filter (Ewall) in front of our mail server that scans for viruses and spam.
We recently transferred to Eset V3 instead of McAfee. But this filter needs command line scanning.
But I can't get it to work.
At the moment I have this in my commandline:
C:\PROGRA~1\ESET\ESETNO~1\ecls.exe /log-all /aind /no-boots /adware /sfx /unsafe /unwanted /heur /adv-heur /action=clean

But this doesn't work. I get the message Output buffer is empty?
What am I doing wrong.

I also installed Xmon on our exchange 2007 servers but what directory's should I exclude in AMON? I can't find a straight answer to this. One person says this, another that. I can't find a good answer though. Thanks in advance.

 

Nobody has a hint for me?