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updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

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New Contributor

updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

using win7. firefox was running fine until updating to v18. i see in release notes that proxy server was updated! i have tried changing the proxy server setup but still no luck, it is setup just like ie right now and ie will connect. i also checked windows firewall (which is my only firewall) and followed instructions on removing entry and adding it back but still no luck.

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16 REPLIES
Site Moderator

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

New Contributor

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

I'm behind ForeFront TMG and have similar issues. I'm wondering (uneducated guess) if there's an issue with proxy authentication?

If I open the Net tab of Firebug, I can watch each individual request start and end in milliseconds, but happen roughly two seconds apart.

With TCPView I can see Firefox produce four or five new UDP processes a second, and close out each one about two seconds after it starts.

WireShark shows aobut 60 UDP proxy-control packets back and forth between every HTTP request, but I don't know how to parse that data.

New Contributor

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

thanks for the reply.

i tried removing "mozilla firefox" from the firewall's allowed programs list, but when i launch firefox the firewall does not ask for permission.

i also worked through the suggestions in the provided kb links, but still i can not access the external web.

i tried loading a site on my company's INTRAnet and that page does load... which i think further suggests a problem with the proxy.

i tired various proxy settings but that does not solve the problem. currently i have it set just like ie (which always worked in the past).

thanks.

New Contributor

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

also... my proxy settings are set to "Use system proxy settings"

New Contributor

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

My proxy is also set to Use system proxy settings.

Disabling the proxy in Firefox resolves the performance issue. our network admins have configured Forefront to proxy all traffic from Firefox. This means we aren't using the authenticated proxy client (e.g. some users have permission to access social media). It's not a long-term solution, though.

Site Moderator

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if the "Use the system proxy settings" setting or one of the others doesn't work properly.

See "Firefox connection settings":


  • Tools > Options > Advanced : Network : Connection > Settings
New Contributor

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

i have tried all the various options for the proxy settings (except "manual") and still i can not connect to the external web.

Site Moderator

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

New Contributor

Re: updated to firefox 18, cannot connect anymore (ie does), i think it it proxy server related.

ufortunately SafeMode does not appear to be easy with bitlocker enabled... i'll let you know if i can figure out how to test this.