VNC and Zonealarm

Glenn Mabbutt gmabbutt "at" quartetservice.com
Sat, 29 Sep 2001 14:50:06 +0000


Although I personally haven't used ZoneAlarm, a general suggestion is that
VNC (and most "remote control" apps) are fairly processor/RAM intensive.  By
the description, I'm assuming the Win98 box has VNC and ZoneAlarm.  I would
suggest finding a shareware prog that will let you monitor CPU/RAM usage
(they exist, just can't remember a name off-hand), and then try it with
ZoneAlarm enabled/disabled.  My hunch is that ZoneAlarm is simply putting
the processor "over the edge" in terms of usage, as it's examining every
packet that leaves/enters the box.

-----Original Message-----
From: Seb Wills [mailto:saw27 "at" mrao.cam.ac.uk]
Sent: Friday, September 28, 2001 11:08 AM
To: vnc-list "at" uk.research.att.com
Subject: VNC and Zonealarm


I use VNC between two machines on a LAN (the client being a Win98
machine). Normally, VNC is highly responsive, and can do a full screen
refresh in less than a second.

If I enable ZoneAlarm (a free personal firewall which seems to be
generally fairly highly regarded) on the client machine, VNC becomes
unusably slow - it can barely keep up with moving the cursor around, and a
full refresh takes 10s of seconds.

Initially I assumed ZoneAlarm must just slow down all traffic a heck of a
lot. But if I FTP a 5Mb file between two local machines, ZoneAlarm makes
negligible difference to the transfer rate (433k/s instead of 466k/s).

Can anyone suggest why ZoneAlarm is particularly affecting VNC performance
and how to get round this (other than turning off ZoneAlarm when I use
VNC)?

Thanks

seb
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