UltraVNC

Turns out there was no problem with VNC, but rather the machine running the VNC server. Never found out what the problem was, but when we switched to a different machine, the problems went away.

In ultravnc.ini, what is the meaning of IdleTimeout? The default value is IdleTimeout=0...what does it mean to set this value to zero?

I searched the forum, and found only this (which was not particularly helpful):

Rudi De Vos wrote:idleTimeout set to 0==socket timeout (MS buildin)

Is there any way to force VNC to use UDP instead of TCP?

What are the units? For example, if I specify a value of KeepAliveInterval=5, is that in milliseconds, seconds, minutes, etc.?

In ultravnc.ini there is a parameter called KeepAliveInterval. I believe the default value is 5. What is the meaning of this parameter? Is there any documentation for ultravnc.ini?

In the server log, I see lots of messages like:
.\vncservice.cpp : SelectHDESK to Winlogon (2c) from 204

What does this mean? What is "SelectHDESK"?

Here are the relevant snippets from the viewer and server log files...I hope someone can help me understand this problem - or at least how to interpret these logs. Also, I have two specific questions: Q1: What is the meaning of this progression (from the viewer log): bufsize expanded to 205056 ...

Thanks, I was able to log the client messages using the command line:
vncviewer.exe -loglevel xxx -logfile xxx

Using ultravnc viewer 1.0.5.6, the connection randomly drops - sometimes as quickly as 2-3 minutes, and other times it takes an hour or more. The only suspicious thing I see in the server log is: .\vncservice.cpp : SelectHDESK to Winlogon (2c) from 230 --An existing connection was forcibly closed by ...

How do you configure the ultravnc client/viewer to log info to a file, and where is that file located? On the server, the logging option is in the admin properties window, but I don't see anything about logging in the viewer options window.