+ 0 Votes So, it really is an "eternal" 404 then! seanferd 4 years ago Is the 404 served by a different subdomain of the site? If so, the DNS cache may need to be flushed. Don't forget that FF 3.5 has DNS/Link pre-fetching engaged by default (which may or may not have any bearing on this). So you might want to clear the History.