I-Firefox Community Forum

I guess I'm hoping an engineer or someone who works on firefox can resolve this cause it's always what pushes what me away.

I'll be sick of Chrome harvesting all my data, I'll download firefox, and I'll set it up. A couple years ago I deleted my chrome profile and switched completely over to firefox. I want to say once a month, I'll open firefox and websites won't load. If they preload they'll act like they're offline.

It's happened to me on Windows machines and Mac machines.

If someone wants to seriously drill down and figure out why this happens across platforms and DECADES, I am happy to provide logs and video chat or something.

Without any change made on my part, effective May 18, have been denied access to the web. This even includes long time bookmarked important investing/banking, etc. Have checked macOS Privacy & Security settings but not aware of any blocking there. Has recent Firefox update changed things? I have not updated Firefox updates for some time.

Why can't I open?

https://water.weather.gov/ahps2/hydrograph.php?gage=porm2&wfo=lwx

This is what I get: Server Not Found

Firefox can’t connect to the server at water.weather.gov What can you do about it?

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

Learn more…

How can I upgrade to windows 11 or is it to late? Can't connect to internet. Everything else is house is fine. Says Firefox disconnected. I can't sign in on laptop, says windows 10 support expired 10/2025?

Server Not Found

Firefox can’t connect to the server at dhakaeducationboard.gov.bd What can you do about it?

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

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).

I'm on a private home network with an internet connection. When I try to use Firefox it displays a message saying "You must log in to this network before you can access the internet".

Many websites, e.g. Amazon, won't load and an 'Open network login page' button is shown. When I click this it takes me to a Mozilla page talking about Captive Portal, but there's nothing about how to stop this happening and access those websites.

Other browsers, e.g. MS Edge, or Brave, have no problem access these websites.

How do I fix this problem?

I am using 140 ESR version on linux with Cloudflare's DNS over HTTPS and with DOH active for some reason resolving a domain like d3oklwo3y1bx83.cloudfront.net will resolve to local host IP 127.0.0.1.

I am using firefox about:networking#dnslookuptool to test resolution of the domain d3oklwo3y1bx83.cloudfront.net Both with DOH on and off the resolution remains local host. I tried another browser on the same workstation and I was able to receive a resolution of 13.225.193.203 13.225.193.133 13.225.193.64 13.225.193.58 Why is firefox ESR not able to resolve that domain? What are causes ?

Is is firefox dnslookuptool results.

Server Not Found

Firefox can’t connect to the server at student.maharashtra.gov.in What can you do about it?

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

Learn more…

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?

I have noai.duckduckgo.com set as my default search engine. Almost always (but not quite every time) when I type anything into the address/search bar, I get a page with a "Server Not Found" error. (See attached image.) Refreshing the page immediately brings up the results without issue, but I consistently get the error first.

Oddly, if I go into settings and switch to a different search engine and then switch back to duckduckgo, the issue will briefly resolve and it'll work fine for a short while... and then I start getting the error again.

Is there any way to fix this?

I use Firefox as my default browser. When I click on a link in my apple mail it doesn't appear but when I right click to check the Firefox icon, it shows that a window should be open (call it mystery window). In the photo it's the "Settings". I cannot seem to access it. (It used to be that if I clicked it, it would open.) If I right click the icon I can open a new Firefox window but the one I originally tried to open still does not appear. That's how I opened this page. If I've opened a new window and I right click and select "Show all Windows" I can see the original window but I still cannot access it. I've tried quitting Firefox and shutting down my computer but when I restart my computer the Firefox icon still shows that the mystery window should be open. Still cannot access it.

This is a fairly new problem that started sometime in the last few months. i have an Apple computer.

As described, firefox is entirely not working for any website. This happened after my computer crashed (hardware problem) and I restarted twice, but could be related to a firefox update that was waiting for me to restart.