HTTP and HTTPS connections time out--only one computer on the LAN has this problem. Also affects Internet Explorer
For the last few days HTTP and HTTPS connections on one computer on my LAN usually time out or fail to load completely. This also affects Internet Explorer on the same machine, but email, FTP, etc. seem to be working normally. The URLs that do not load in the browsers ping normally, and load normally on another machine on the same LAN. Running Firefox in Safe Mode does not help.
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A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox.
See Server Not Found - Troubleshoot connection problems and Configure firewalls so that Firefox can access the Internet and http://kb.mozillazine.org/Firewalls
A good tip, but it didn't work out. I turned off the software firewall completely and it didn't seem to change anything--even simple pages time out loading, or take minutes to fully load.
Sometimes you only disable the user interface of security software, but the firewall services are still running in the background.
Actually, after a couple more days this seems to have fixed itself! Another mystery.