Over the last 6 months or so, I've been having intermittent problems with one of my domains hosted on my VPS. Every now and then, when trying to browse to the domain, my users get this sort of error: Code: Firefox can't find the server at www.xxxxxxxxxxxxxx.com. * Check the address for typing errors such as ww.example.com instead of www.example.com * If you are unable to load any pages, check your computer's network connection. * If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web. Browsing to the site by ip.ip.ip.ip/~xxxx gets there fine. All other domains on the VPS aren't affected and if tested at the same time resolve fine. Is this some sort of DNS problem I am having on my VPS? What can I do to identify the issue?