Proxy detection   

I have an IE browser extension that opens a socket to a Jabber server, 
preferably on port 5222. I've had a problem with users being stuck behind 
firewalls, so what I've done is to try to detect whether there is a LAN proxy 
configured, and to tunnel out through that over port 443, using CONNECT.

In order to check whether there is a proxy in use, I've been reading the 
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings 
registry key, and looking at the ProxyEnable value. If it is non-zero, then I 
read the ProxyServer key to get the proxy address.

My problem is that a user has told me that this only works if the proxy 
configuration has been manually set, but not if the "automatic proxy 
detection" feature is in use. Should I be detecting proxies in some other way?

Thanks, Malcolm

date: Mon, 3 Apr 2006 08:35:02 -0700   author:   malcolm