Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox can't access any WEB Site and always present the same message "Firefox can’t establish connection with server SERVERNAME". However if I use IE or Google Chrome the web site is accessible . I've already uninstalled and installed FireFox .

more options

Firefox can't access any WEB Site and always present the same message "Firefox can’t establish connection with server SERVERNAME". However if I use IE or Google Chrome the web site is accessible . I've already uninstalled and installed Firefox but the problem doesn’t change.

Firefox can't access any WEB Site and always present the same message "Firefox can’t establish connection with server SERVERNAME". However if I use IE or Google Chrome the web site is accessible . I've already uninstalled and installed Firefox but the problem doesn’t change.

All Replies (2)

more options

Did you check your security software (firewall)?

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

more options

After changing the security level of my firewall software, Firefox starts working again. Thanks. Après modifier le niveau de sécurité du Firewall, Firefox a marché bien. Je vous remercie. Após midificar o nível de seguraça do Firewall, o Firefox voltou a funcionar.