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.

Avatar for Username

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

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

Firefox says that I have a firewall that prevents me from connecting to Internet?

  • 1 resposta
  • 5 have this problem
  • 1 view
  • Last reply by cor-el

AnonymousUser
AnonymousUser
more options

I´ve used Firefox for a while now and I was really happy until now it just won´t work any more. When i try to connect to Internet with firefox I get a message "Connection failed" My firewall is preventing me from connecting according Firefox. But I´ve really done everything from turning my Firewall off and it still doesn´t work. I do not have any antivirus thats preventing Firefox from connecting. Internet Explorer still works perfect though.

Please, could someone help me because i don´t want to use Internet Explorer.

This happened

Every time Firefox opened

I was updating Firefox

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.2; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)

I´ve used Firefox for a while now and I was really happy until now it just won´t work any more. When i try to connect to Internet with firefox I get a message "Connection failed" My firewall is preventing me from connecting according Firefox. But I´ve really done everything from turning my Firewall off and it still doesn´t work. I do not have any antivirus thats preventing Firefox from connecting. Internet Explorer still works perfect though. Please, could someone help me because i don´t want to use Internet Explorer. == This happened == Every time Firefox opened == I was updating Firefox == == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.2; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

In Firefox 3.6.4 and later the default connection settings have been changed to "Use the system proxy settings". See "Firefox connection settings" in Server Not Found - Troubleshoot connection problems

You can find the connection setting here: Tools > Options > Advanced : Network : Connection If you do not need to use a proxy to connect to internet then select No Proxy'

Another 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