[Trisquel-users] Is there a system-wide http proxy set in Trisquel 7?

[dhunt]

When I try visiting the login page on craigslist.org, and entering my  
credentials, then hitting the 'submit' button, I get an error 404.  if I use  
a live image of some other distro, I can login correctly.  There must be  
other sites that fail in this way, though I have yet to encounter one.   
Setting my browser settings to 'no proxy' seems not to have fixed this.

Any ideas?
-Dave