Auto Detect Proxy

[Guest]

We are using WPAD to get proxy settings from a webserver. On a handful of
our clients, IE 6 is experiencing a 30 second delay when auto detecting the
proxy settings. I'm trying to figure out why this might be happening.

This is what I've done so far:

1. I have no DNS issues. I can ping wpad.<fqdn> and it returns the correct
machine.

2. I can telnet to port 80 of the hosting webserver, type GET /wpad.dat
HTTP/1.1 and the config file is returned within seconds.

3. I have cleared temporary internet files and the like.

I was hoping someone has seen this before and could offer some insights
and/or suggestsions.

Thaniks.

 

[Jon Kennedy]

See if the discussion in this thread is helpful:
http://forums.isaserver.org/ISA_2004,_IE_and_Proxy_settings/m_2002001015/tm.htm

When you use Internet Explorer on a Windows XP-based computer, Internet
Explorer may take 8 to 11 seconds to open a Web page
http://support.microsoft.com/kb/906650/en-us

Also make sure proxy caching is not disabled:

How to disable automatic proxy caching in Internet Explorer
https://mvp.support.microsoft.com/default.aspx?scid=kb;en-us;271361

Other possible helpful articles:

"Automatically Detect Settings" Does Not Work if You Configure DHCP Option
252
http://support.microsoft.com/kb/307502/en-us

Web Proxy Auto-Discovery (WPAD) may not succeed when Internet Explorer 6
sends a DHCPInform request that includes the class ID of the client computer
in Windows XP
http://support.microsoft.com/kb/905301/en-us

Internet Explorer may delay up to 10 seconds before it starts for the first
time in Windows XP
http://support.microsoft.com/kb/907455/en-us