[Zope] Site Disappears!

[zope at 2012.vi]

Hi;
I have a strange (to me) problem where a client of mine reports she 
can't pull down her Web site and has had at least one client call from 
outside her area to complain the same thing. I can see her site fine 
(I'm on a different island) and have friends in CA that can pull down 
the site as well. I haven't been able to get the OS/IE version 
information I'd like, but I don't think this is a browser problem since 
(a) she could see the site fine before, and (b) she gets a Zope welcome 
page, indicating she's at least hitting my box.

I find no errors in either the Zope error log nor /var/log/errors.

My configuration is BSD 5.3, Pound as reverse proxy and then passing to 
Zope with mapping in VHM.

Thanks for any help you can offer here;
beno