Window 7 IE8 experts please

[stealthn]

Alright I'm stumped

I have a nice new laptop with Windows 7 and IE8 that works fine in my office. I can browse to anything blah blah blah, but when I test it at a branch office IE8 can only browse to my MS Server.

I cannot access any other website on my Corporate network from the branch with IE8. I tested a vista PC with IE7 and no issues as all.

When I try IE8 it resolves DNS, I can ping, I can map drives, everything, I just cannot browse to any web servers (Corporate or Internet) other than the Domain one.

I have tried every fix from MS and other forums and I know the only real fix will be to use a different browser, but I have so much time invested, I want to get to the root cause.

I've reset the broswer to default settings, cleared the cache, added the other sites to the trusted list, turned off add-ons, logged in with "admin" priviledges, restarted, everything, still nothing. I see traffic flowing in both directions, the browser just sits there "waiting for the site"

Thoughts?

[stealthn]

Fixed it.

For you Uber geeks that care; it was an MSS/MTU issue. I changed both firewalls to clear the DF bit and set the inside interfaces to MTU of 1380.