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When I try to log on to Mozilla, I get:Firefox can't establish a connection to the server at en-us.start3.mozilla.com. please advise

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When I try to log on to Mozilla, I get this:Firefox can't establish a connection to the server at en-us.start3.mozilla.com. Please advise -- I've been getting this for the past two days.

URL of affected sites

http://en-us.start3.mozilla.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GoogleT5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729)

When I try to log on to Mozilla, I get this:Firefox can't establish a connection to the server at en-us.start3.mozilla.com. Please advise -- I've been getting this for the past two days. == URL of affected sites == http://en-us.start3.mozilla.com/firefox?client=firefox-a&rls=org.mozilla:en-US:official == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GoogleT5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729)

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See: http://kb.mozillazine.org/Error_loading_websites .......... A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, maybe 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 Configure firewalls so that Firefox can access the Internet and http://kb.mozillazine.org/Firewalls