Firefox Support Forum

Mac OS X 10.10.5

Firefox 40.0.3

I have set FireFox to use a proxy(just the browser not my entire system) but there simply is no prompt for username and password in Preferences: Advanced: Network: Connection settings. Additionally, many times people bring up changes that need to made in about:config but either those preference names no longer exist or they have no effect on this issue.

Does anyone know how to get FireFox to prompt for username/password or where to find the login?

Thanks, MDS

Switching from Safari to Firefox, I wanted to use the same proxy settings. My first try was to use the system's settings, as it gets automatic proxy configuration from the right URL. This worked alright for Safari! On Firefox however, if I'm connected to the VPN I can access all websites in our VPN, but none outside, as I get the SEC_ERROR_UNKNOWN_ISSUER (can't always add an exception) As soon as I exit the VPN, firefox is "unable to find the proxy server".

I've tried all other kinds of ways to connect via that proxy - manually connecting, by URL in firefox or by automatically detecting, but nothing solves my problem. The automatic configuration shouldn't be the problem as it works fine for Safari and shouldn't be any different for Firefox.

I'd really appreciate any help on the subject.

My network is using proxy to get connected to internet. User authenticate to proxy using username and password from Active Directory. I am unable to authenticate to proxy, it keep asking password even I have supplied the correct password. I tested the condition using other browser and it works with Chromium. How should I connect to the proxy ?

Attached the pop-up

at work we use a proxy network with authentication ONLY with the firefox browser i have proxy problems. I see the page access denied by the proxy server, the only solution is to close and open the application.

In Firefox i set an SOCKS5 proxy. But for the past months it is numerous case that i accidentally accessed webpages being not proxiffied / not using proxy and i was unaware about this and realised the fact too late..

For example after proxy managing plugin installation or i temporarilly disabled proxy.

My aim is to prevent me accessing webpages without proxy. I mean somehow locking the firefox proxy configuration so even plugins cant modiffy my firefox proxy setting.

Just want to be sure i will never access internet without proxy.

Having latest Firefox and WIndows Vista.

PS: i sitll need unproxiffied access to certain websites. I have the whitelist in my Firefox proxy configuration now.

When I browse to https://www.pandora.com/ I get the "Secure Connection Failed" error with exactly the same text as in the screenshot at https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

This is a really poor error message. It tells me nothing about what's actually wrong and how to fix it. WHY did the secure connection fail? Is there any way to find this out?

The site gets an A- from SSL labs https://www.ssllabs.com/ssltest/analyze.html?d=www.pandora.com&lates... and definitely supports TLS 1.2, so I'm pretty sure the problem is with Firefox and not with Pandora, but the error message is horrible regardless.

Firefox automated update breaks it. After it is broken, downloaded Firefox compressed file firefox-64.0.tar.bz2 twice. Extracted to Downloads directory. Wouldn't run after extraction and running Firefox binary. Twice. Downloaded. Extracted. Wouldn't run. Broken. From the directory of the extracted binary, tried to run the firefox binary from a terminal. Native Mozilla Iceweasel runs instead. The following is the output: knoppix@Microknoppix:~/Downloads/firefox$ firefox (process:4452): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed FoxyProxy settingsDir: /home/knoppix/.mozilla/firefox/lllxrd8r.default-1529708858245/foxyproxy.xml I have Knoppix 7.2.0 in perfect health. Before automatic update, firefox used to run. Tor browser based on Firefox runs. Google Chrome based on Firefox runs. Everything else runs. This is for your information. Sent messages to forum and community. No response.

Regards,
Rajib

I get the error message at the bottom. Yes, my firefox already has "no proxy" selected in the preferences page. I'm able to use Edge fine, but for firefox it does not seem to matter what network I try to connect to. Occasionally it will load some websites like Wikipedia, but then immediately fail anything past that or if I try a different site. Sometimes if I try youtube it will only partially load and then the unable to connect to proxy message will appear in the embedded page videos. Sometimes trying a network reset and then restarting the pc fixes the issue, sometimes it doesn't... I don't know if it has anything to do with this issue but I'm also using NordVPN. Sometimes I am able to get to websites before nord connects itself, sometimes it doesn't matter even if nord does not try to autoconnect. Sometimes it will connect and my internet works fine. I've tried setting up an actual nord proxy through firefox preferences and it doesn't help either. Proxy or no proxy I can't get things to load. When attempting to reach sites I'll get a little message in the bottom left corner of firefox as it tries to reach a website, stuff like: reading img-getpocket.cdn.mozilla.net, looking up *sitename*

Don't know what the problem is and I exhausted my limited IT knowledge a while ago, googling for answers hasn't helped.

Unable to find the proxy server

Firefox is configured to use a proxy server that can’t be found.

   Check the proxy settings to make sure that they are correct.
   Check to make sure your computer has a working network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

Hi, Im using Burp Suite for testing purposes on my other pc. I have to open proxy 127.0.0.1:8080 in order to listen in. I've checked "Use this proxy server for all protocols" and "Remote DNS" However when i change the proxy settings on firefox and try to load up a website it says: "Unable to find the proxy server"

Anyone that can help me?

Firefox version:49.0 Operating system:Windows 7 Installed plugins:

• Google Update
• NPRuntime Script Plug-in Library for Java(TM) Deploy
• Next Generation Java Plug-in 11.73.2 for Mozilla browsers
• Shockwave Flash 23.0 r0
• 5.1.50901.0

Hi All,

We are experiencing an issue with random intermittent Mozilla Proxy Authentication prompts. We are running Mozilla firefox in a Windows domain and using a clearswift proxy server. I've tried a large number of configuration changes with Firefox but still get these annoying prompts. This obviously looks bad to our user base. We do not suffer the same issues with IE11 or Google Chrome.

Please can anyone help before we look to remove this software and go for an alternative browser?

Many Thanks,

Kirk

Every time I open firefox, I get prompted to enter my proxy credentials. This is extremely annoying, because I open and close the browser >20x a day.

This was never a problem before because I used the wonderful AutoAuth addon which automatically took care of that kind of thing, but now with the new version of Firefox the addon had to be re-written and now it doesn't work in the same way - notably that each set of credentials have to be tied to a website, and that doesn't work for a proxy.

I have signon.autologin.proxy;true, but this doesn't seem to work, or do anything at all. I also searched around the internet and found some really old fixes, but none of them helped or are applicable anymore.

If for some reason this can't be fixed, ideally at least change the startup auto-connect prompts (presumably looking for updates) to wait for an internet connection, wait for 1 minute once I actually access the internet and have auto-auth do its thing, or stop them from triggering more than once a day.

Any help would be greatly appreciated, this is driving me mad!

I have users trying to download firefox updates, but they are being blocked by the proxy. If I whitelist download-installer.cdn.mozilla.net. Will that give users the ability to download other installs like add-ons?

Hi, gentlemen, how are you?

We have in our environment several versions of Firefox installed on our workstations, configured a Proxy GPO with a script written in VBS to do the configuration automatically. It turns out that the browser even pulls the settings that we set in the script, but only works after going into configurations and networks, if we do not do this step, Firefox simply does not browse.

Can you help us? Grateful

Firefox 60.2.0 ESR on Win7 and Win10 - but a lot of versions below had same problem

We use a proxy - normally with a .PAC file via System Settings but tested settings within FF with .PAC file or directly entered proxy.

It prompts after every launch of FF for Proxy credentials and NEVER shows the "Would you like Firefox to save this login..."

For any other site it always offers storing the credetials and it works like it should be.

EXCEPT I found one solution: When launching FF Cancel the "Authentication Required" (sometimes 3 to 7 times canceling). Than open any page on the web and authenticate against the proxy - it will show the "Would you like Firefox to save this login..." and it is visible in the password store. Thereafter everything is operational.

Another problem: If you ever click on "Never save" for proxy saving credential this proxy site it NOT added to the Exceptions list and cannot be removed and I did not find any way to solve it except removing the Firefox profile.

Tested with German and English Version Searched for a solution since a year ever and ever again configured dozens of parameters in about:config which I found on the web. Credentials for every other site are always saved.

Users with a old Firefox profiles with saved proxy credential do not have this problem, only new FF profiles - since at least a year possilbly longer.

Hello! I have access to internet via proxy. It requires autentification. But firefox doesn't save login and password for that proxy and prompts autentification each time. Is it possible to get this issue fixed? Firefox 59.0.2 64bit.