I had a similar problem with ubuntu a while ago. It turned out that it
was because FF was using IPv6 when it attempted to connect. The way I
solved it was by typing "about:config" on the FF address var and looking
for the IPv6 option and disabling it (type ipv on the filter and you
will find it really fast). 

As far as Thunderbird goes, it might be the same thing except I don't
use it so I'm not sure how to fix that. I would suggest you try another
client like Evolution and see if you can connect from there, and if you
do, than you know that might be the problem. Try connecting from
different browsers too, see if those work and let us know what you
find. 

Good Luck!
-DX

On Sun, 2007-06-24 at 12:15 -0700, Robert N. Eaton wrote:
> Robert N. Eaton wrote:
> 
> > I'll buy a new memory stick and see if that makes a difference.
> > 
> > Otherwise I'm frustrateder and baffleder than I was before, if that were 
> > possible ;-).
> 
> Just got back from Fry's, installed a gig of Corsair memory (an upgrade 
> from 512 megs of no-name memory). Both WinXP and Fedora 7 work snappier, 
> showing that the memory works.
> 
> In Fedora 7 Thunderbird doesn't connect at all: it times out. Firefox 
> connects to a very few sites and doesn't seem to finish the connection, 
> no matter how long it tries. Seems like a software problem, but _which_ 
> software? SELinux? Firewall?
> 
> And, yeah, I guess it's possible (see above ;-).)
> 
> Bob Eaton
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