Lost all network server capability

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http://ubuntuforums.org – Hi, Recently I got a new computer and upgraded to 13.10 - my old computer didn't have a video card that was good enough for Ubuntu 13, so I bought a new System76 with 13.10 preinstalled. Generally, everything works quite well. But now my network servers (mail and Apache, especially) don't work. I can get ssh to work, so something is getting through, but as far as Apache is concerned, I can't even get anything like a failed attempt to show up in the error log, or the access log. Nothing. The computer appears to have no idea that anyone outside requested a service. Incidentally, Apache (Hardware)