I see the log file in sys\zenworks\remmgmt\server\logs, but there is no
data in in. I have put the logging to VERBOSE, and there is information
on the server screen, but the log file stays at 0 bytes.

If I stop ZEN by doing a ZFDStop.ncf, the data is written out to the
file. Then when I ZFDStart.ncf, a new, empty log file is started again.

How can I get up to date information into the log file without
stopping/starting ZEN?

If I can't get up to date info, how can I stop only the WOL service,
and start it again?