[Zope] Can see zope from local host, but not from anywhere else

This maybe a very basic question, so please be patient. I've just done a test installation of zope. It's from my host (http://dathorn.com). I've run ./install and ./start, and if I ssh to my host and run lynx, I can visit the site using every domain I can think of: http://localhost:<port>, http://<ip>:<port> http://<domainname>:port. However, if I try any of these urls from a browser on my local machine, they just fail (after a long wait). Is there a trick I am missing, or is zope not something I can run from this host? Thanks in advance joan