HTTP Error Code 400 with IE8 only with MS websites

Soldato
Joined
16 Dec 2005
Posts
14,443
Location
Manchester
As title, I have a Windows 7 computer here where a particular user gets HTTP 400 errors when trying to access any Microsoft website. The specific error is:

Bad Request. HTTP Error 400. The request is badly formed.

It is not an SSL error, as I can connect to and log into a variety of websites just fine such as GMail.

I have tried disabling add-ons, resetting IE8, I even uninstalled it and reinstalled it and the error remains. There is no problem with the websites using Firefox or Chrome. Nothing at all shows up in the Event Viewer.

Strangely IE works fine when running as Administrator, so the problem is specific to this one user. I tested another user account to be sure and no one else has reported any problems with IE.

I have tried everything I can think of and nothing works. Any ideas?

EDIT: OK I have narrowed down the issue - it doesn't like any website built with ASP.NET. This includes most if not all MS websites, MySpace, the companyweb and other Intranet sites and just about every other ASP site I can find. Still no closer to finding a solution, but at least I have an idea what is going on!
 
Last edited:
Welp, thanks for all the help :D

It turned out to be a buggered User-Agent string. Some crazy registry settings added about 200 extra characters of numbers and random HTML special character codes. A few nuked registry keys later, all is good. :)
 
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