VNC and Zonealarm

Dietmar.Friesch@isisconsulting.de Dietmar.Friesch "at" ISISConsulting.de
Sat, 29 Sep 2001 11:14:46 +0000


Hi Seb,
I've installed zonealarm vnc and tight vnc stuff.
I don't observe this problem. The difference however
might be that I've installed the latest version of
zonealarm a f t e r I had vnc installed
Maybe its worth a quick try to uninstall zonealarm
and re install it. That's not reasoning but it may
help
Dietmar


-----Original Message-----
From: owner-vnc-list "at" uk.research.att.com
[mailto:owner-vnc-list "at" uk.research.att.com]On Behalf Of Seb Wills
Sent: Friday, September 28, 2001 5:08 PM
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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