Many network operations do not work, as though they're being blocked by firewall.

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http://forums.fedoraforum.org – I'm using F17 (XFCE spin, if it somehow matters). I have disabled SELinux and turned off the firewall using the GUI front end, but I still get "access denied" when trying to connect to Samba shares and NFS shares, and other things like the weather panel applet also can't connect to the internet. It acts exactly like I would expect it to act if all this stuff was being blocked by a firewall. But I can't seem to find exactly what's blocking it, or how to configure it. Any ideas would be appreciated. (HowTos)