Hey,

after looking through many Forums and solutions on the internet, nothing can resolve my issue, so i hope this one can help. I just switched to Firefox and have the reaccuring problem, that i cannot load sites, that are located in my local network (e.g. homeassistant.local; 192.168.8.265:2283).

I always get a "server not found" error from firefox and the certificate information, that i am communicating through an unsecured connection (haha, yes good joke firefox. I know my local services do not all have an SSL certificate.) I already tried altering settings for Proxy, DNS over https, MACos Safety settings but nothing helps. I am jsut looking for that one "trust this domain" button, that i get on 'ALL OTHER BROWSERS like Chrome, Safari and Edge...

P.S.: All the services are up and running and i can reach them through any other Browser.

Apr 3, 2026, 04:18 CST

In the last 48 hours I haven't been able to access the following - https://www.co-operativebank.co.uk - they do not appear to be the problem - when I try the link the 'retrying' symbol on the top left of screen (?taskbar), flashes extremely rapidly and it appears the system can't find the website. Are you aware of this issue.

how do i delete or remove the message about could connect error

Contributor note: See also /questions/1576275 for the detailed error message.

when i open microzain website he give me these error

Server Not Found

Firefox can’t connect to the server at microzaib.com What can you do about it?

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

Good Morning,

my Firefox /Mac OS blocks my NAS in my local network. otherwise I can contact my NAS via Firefox / Ipad OS. Where´s the problem, Firefox kann sich nicht mit dem Server auf 192.168.178.112 verbinden

I don´t find any switches to change.

reg

Viktor

Have been a Firefox user for many years and have always been able to connect to my NAS with any problem. Today that option has now disappeared and I get the dreaded "Looks like there’s a problem with this site" page. I am a Mac user updated to 26.4. and the latest Firefox update. The NAS is working well and I am able to connect without problem using Safari but I am a Firefox user and do not wish to change. Can anyone offer a solution Thank You

All of a sudden I am finding that Firefox will not connect me to certain websites such as Walmart, Doordash and even Firefox itself. It looks like it's trying to but it just gets stuck. What's causing this and how do I fix it?

For the last ~6 months, my Firefox Windows build has been stuck connecting to numerous websites. Whether I enable auto-detect proxy settings or no proxy settings at all, the same result happens. The websites hang and do not resolve. Occasionally, some of the new Firefox releases have improved this, but then they revert to not working. I'm about to give up on this platform and switch entirely to Chrome which never has this problem.

Has anyone else experienced this? How if at all have you been able to fix it?

seit einigen Updatesversucht das System verschiedene Webseiten ohne Erfolg zu öffnen. Es erscheint keine Fehlermeldung, auch kein Abbruch wegen Zeitüberschreitung oder der Hinweis, dass der Server nicht erreichbar ist.

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!

Setup: macOS Tahoe (26.4) and Firefox 149.0

=

Behavior: Out of the blue this morning, every website I try to visit in Firefox returns "Looks like there’s a problem with this site". Every other browser works fine.

Things I've tried, that haven't fixed it: - Ruled Out DNS: Sites like 1.1.1.1 and my home router's IP return the same issue in Firefox, but also resolve in any other browser. - Firefox Safe Mode: no fix - Deleted All Settings, Reinstalled Fresh: - Removed the Firefox App, deleted:

       - ~/Library/Application\ Support/Firefox
       - ~/Library/Caches/Mozilla
       - ~/Library/Caches/Firefox

...and then downloaded and installed 149.0 fresh. - Refreshed Firefox (via [link] - about:preferences (toggled between FALSE and TRUE, testing each time) via this YouTube video

- network.dns.disableIPv6

- network.dns.disablePrefetch
- network.dns.disablePrefetchFromHTTPS
- network.dns.disable

....and in desperation, I checked my Mac for Malware (clean)

I'm at a complete loss: every other browser works, but Firefox is a 100% fail for all websites. Any thoughts?