Unexpected apache2 (and other) behaviour on upgrade to Feisty

[Michael T. Richter]

I decided to take the plunge today and upgraded to Feisty on my test
machine.  This was a mostly painless process (the only pain being some
agony over wxWidgets 2.6) and everything seemed to be working fine.

Fine, that is, until I tried to access the web server.

I can access the web server from the machine itself using:
- elinks http://localhost
- elinks http://192.168.0.2
- elinks http://tristan (the machine's name)

From any other machine on my network the web server is invisible.  I
can, however, ping 192.168.0.2 with no problems.  I can access it by
SSH.  I can't, however, access it through VNC.

Did some kind of firewall get included in Feisty with no documentation
and no app in the menus to configure it?  If not, what is going on with
my formerly-functioning system and what can I do to get it back to
functioning?

-- 
Michael T. Richter <ttmrichter at gmail.com> (GoogleTalk:
ttmrichter at gmail.com)
Our outrage at China notwithstanding, we should remember that before
1891 the copyrights of foreigners were not protected in the United
States. (Lawrence Lessig)
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