Forum der Gemeinschaft Firefox

Every time I start Firefox lately, it keeps prompting me: "You must log in to this network before you can access the Internet." I have no idea what this means and have no problem accessing the Internet in any case. What suddenly started causing this !#@%$ message and how do I turn it off?

Issue Summary: When disconnecting from a corporate Cisco AnyConnect VPN on macOS, Firefox completely loses its internet connection and throws network errors. Other browsers (Chrome, Safari, Edge) continue working perfectly on the home network. Standard troubleshooting steps—like clearing Firefox's DNS cache, changing proxy settings to "No Proxy", turning off DNS over HTTPS (DoH), and flushing system DNS—do not resolve the issue.

Root Cause: Cisco AnyConnect locks low-level socket configurations and routing rules within the active Firefox user profile (prefs.js). Even after the VPN is disconnected, Firefox remains bound to the dead corporate pipeline, a behavior that standard settings menus cannot override.

Proven Solution: The only way to clear the corrupt VPN socket locks is to completely reset the internal profile architecture:Open Firefox, type about:support into the address bar, and press Enter.Look at the top right of the page and click the "Refresh Firefox..." button. Accept the prompt. Firefox will close, securely back up your bookmarks/passwords, generate a fresh profile, and restart.Internet access will instantly return to normal. (Note: You will just need to reinstall your extensions afterward).

Firefox won't load any webpages. Every website I try to open fails to load, even though my internet connection is working. I have restarted Firefox and my laptop, but the problem till exists. I am using a Lenovo laptop. Please help me fix this issue

Starting today (7/8/26), Firefox opens with a "cannot connect" message, have tried multiple online suggestions including downloading and "reinstalling" but nothing works

I keep getting this message at the top of each site I go to: "You must log in to this network before you can access the Internet" It thinks I'm on a captive portal?? I'm at home on my own internet network. Why am I getting this message?

Whenever I load Firefox, for the first minute or so, or the first X attempts at loading (any) website, I just get "Can't connect to server" errors. Eventually it does connect and then has no more issues, unless I close the browser and open a new one, then the process begins again.

New Alienware laptop with a fresh windows 11 install.

Other browsers are working fine, this is isolated to this browser, on this device only.

Things I have tried:

All the suggestions in the connectivity help section Uninstalling Firefox > Deleting my profile data from laptop > Cleaning registry > Deleting anything else that searching for "mozilla" turned up > Clean install without logging into any profile or enabling sync or importing anything (somehow still knows there was a previous install though, just doesn't import anything)

Still the same results.

I've used Firefox for probably a decade now and I am truly loathed to have to move to Chrome, but if I can't find a solution this is just untenable. Any help would be much appreciated!

I regularly and repeatedly get errors messages similar to the one below:

   Server Not Found

   Firefox can’t connect to the server at www.filepuma.com

   'What can you do about it?

   Try connecting on a different device. Check your modem or router. Disconnect and reconnect to Wi-Fi.

I can find no way to correct this. Can you help?

I can not get web sites to load on my computer in windows 10 on fire fox. Whats wrong? Its been this way for a while now. I just get an error message. Why. Little thing just toggels back and forth no loading. Why?

yes Iam trying to connect between my cos.tv in my mainnet wallet with binance wallet I tried from yesterday nothing not connected also I tried with mainnet wallet to connect with meta mask also the same not connect nothing worked iam really tiered I want to start working normally you understand what I mean but I just watch videos without working you know what I mean so what shall I do to fix it please thanks for your helpful

While I tried to connect to the web page "http://eprison.nic.in/npip/public/MyVisitRegistration", I found a reply saying "Firefox can’t connect to the server at eprison.nic.in". Thus, is there any way that I can possibly connect to the web page because I want to pay a VC visit from a distance to my son arrested in Mumbai Central Prison.

I am on a MacBookPro running MacOS 15.5.

My FireFox automatically updated to 139.0.4 on June 10th. Since then, my ability to access the internet with FireFox only has been intermittent - I can connect for a variable number seconds and then it disconnects for minutes or hours. I have no problems connecting to the internet with Chrome or Safari, or with other applications. My perusal of the forums leads me to believe that it is the latest update that is causing the problems.

Has anyone experienced this problem and/or does anyone have a fix? Thanks in advance.