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Delete cookies by going to Internet options and try to re-log in the browser. Also try another browser if deleting cookies doesn't work. Some virus prevent you from logging into particular sites. Install a good anti virus software and scan for virus. I use kaspersky anti virus and haven't had any trouble in a long time.
Hi, If "your browser sent a request that this server could not understand" and "size of request header field exceeds server limit", your request is a bad or oversized cookie. (The same thing is true for "Error 400").
For some very strange reason, it seems 9 of 10 Bad Request messages implicate Firefox.
Simply delete your "Cookies" and everything will be okay. Don't worry about erasing them; nothing bad will happen. You won't lose your internet browser's "Bookmarks" or "Favorites". The worst thing that could happen is you will be asked to retype your username/password when you return to YouTube and some other websites -- that's all.
As you're dumping your cookies, you should also erase all your "Temporary Internet Files" and "History". This will render your computer totally "fresh" in YouTube's eyes. It would be best if you shutdown / reboot after doing this:
Internet Explorer 6: > Tools > Internet Options > Delete Cookies > OK > Delete Files > OK > Clear History > Yes > OK
Internet Explorer 7: > Tools > Internet Options > Delete... > Delete files > Yes > Delete cookies > OK > Delete history > OK > Close (browsing history window) > OK
Hello, This problem would arise due to malware or virus in your browser or when you have large cookies. Check you tube with other browsers. Run antivirus on the current browser or if you are using firefox go to TOOLS->OPTIONS->PRIVACY->COOKIES and clear youtube's cookie and try to use youtube. Similarly do it for other browsers.