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Request header too long for certain sites

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I get Bad Request (Request Header Too Long) on a site in our intranet. It used to work with earlier versions of Firefox and it works ok with IE6. Also it will work if I use the server IP address instead of the server name. I've cleared cookies, deleted cookies.sqlite but nothing seems to fix problem

URL of affected sites

http://

I get Bad Request (Request Header Too Long) on a site in our intranet. It used to work with earlier versions of Firefox and it works ok with IE6. Also it will work if I use the server IP address instead of the server name. I've cleared cookies, deleted cookies.sqlite but nothing seems to fix problem == URL of affected sites == http://

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"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" "Remove the Cookies" from sites causing problems: Tools > Options > Privacy > Cookies: "Show Cookies" See http://kb.mozillazine.org/Clearing_the_cache and http://kb.mozillazine.org/Cookies

See also "Error_loading_some_websites": http://kb.mozillazine.org/Error_loading_websites Websites don't load - troubleshoot and fix error messages