im getting an when visiting my website or uploading something to a website, ie uploading a module zip file in joomla.

Bad Request Your browser sent a request that this server could not understand.
or
Size of a request header field exceeds server limit

This can be solved by one of 2 ways

• Use another Browser
• It's a cookie problem. Either clear your cache and delete your cookies, or go into the cookies folder and delete the cookies for that site manually.