zipzit 0 Newbie Poster

I've got a weird problem. I've got one laptop (Windows Vista) that has weird responses to certain web sites when in wireless mode.

Certain web sites just hang.
http://www.mmba.org works fine.
http://www.mmba.org/forum totally hangs.
http://www.wikipedia.org/ works fine.
http://en.wikipedia.org/wiki/Lltd totally hangs.
I can't utilize any of my Joomla/administrator sites.

The same sites work great when I walk the laptop over to the same wireless router / combo switch and plug in the ethernet cable.

I've checked the wireless and wired protocols on the client computer and both appear the same. From what I can see all other settings are the same. I don't think its the router/switch, as other computers work okay (WIN XP machines)

Its crazy. The problem only appears when there is a .php site or when the web site does a forwarding, but I'm guessing... lots of these sites have automatic index.xyz settings and you can't see what's going on.

I'm getting the same response no matter what browsers I'm using, internet explorer as well as Mozilla Firefox. I've tried watching the firebug to help me troubleshoot, but without much luck.

Anybody been here before? This issue is driving me crazy.

thanx in advance for any help...
zip.