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It was working fine on the new computer until yesterday. Now I get a pop-up box that says: ' Unable to connect The connection was refused when attempting to contact localhost.

The site could be temporarily unavailable or too busy. Try again in a few moments.

If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure Thunderbird is permitted to access the web.

I am trying to be nice but it's should be going both ways . Server Not Found. Firefox can’t connect to the server at www.rebaid.com. AND YOU GIVING ME ADVICE: "Try connecting on a different device. Check your modem or router. Disconnect and reconnect to Wi-Fi." We both know that my router is not the problem nor my PC/device. It's you and you should harder to connect me with a page-site.

I am getting the error "connection timed out to connect to SMTP server". I am running on Linux Mint. The same setting do work on MacOS so there is no wrong config or broken SMTP server. It was working well since a couple of years. I also tried troubleshooting mode but still the same.

Cheers, Thomas

Hello

I downloaded FF 152.0.6 update and my internet went immediately down (Windows 10, 64 bit). Internet box working, Wifi working, Android mobile receiving internet. Once removing the 152.0.6 by system restore, internet worked again. Anybody reported this or have a solution? Thank you

I've successfully connected to a hosted Exchange server through EWS and NTLM authentication (kudos BTW). But there is a problem - often during operations against EWS I'm presented with "Login to account XXX failed" "Login to server YYY with account XXX failed". I can ignore it (cancel) and it will work for seconds or minutes but eventually reappear. Sometimes it's very frequent, sometimes is here and there. TL;DR; connection works, I can read directories and e-mails.

From looking at development tools I see these scenarios: 1. POST requests return 200 always (no messsage of course) 2. Eventually a POST would return 401. Then Thunderbird issues a GET, it returns 401 as well but response includes header WWW-Authenticate: NTLM XXXXXX. Then another GET is issued containing header "Authorization" with the value from previous response. This time it gets 200 and continues without POST requests without a dialog. 3. Sometimes there are more POST requests with 401 (I assume in parallel) before a GET is issued and then I see a dialog. Sometimes it recovers (regardless of whether I cancel or retry), sometimes gets stuck with 401 with dialog reappearing each time it tries something. This case it's similar in sense that thunderbird issues GET with 401 and WWW-Authenticate header, issues another GET with Authenticate header but still gets 401.

If I had to guess I'd say the problem happens when POST requests are issued in parallel, not sequentially. OTOH it might be a problem at the server, but it isn't very likely.

Issues with redirect. A group I am a member of uses Constant Contact. An email is sent with a link to a report. Receive this error:

Server Not Found

Firefox can’t connect to the server at deuaxb4ab.cc.rs6.net. What can you do about it?

This worked last week.

Firefox 152.0.4. Win10

I attended a conference and can't open any of there links due to the fact it is on the cloudfare program???? website is https://s3.us-east-1.amazonaws.com/RETA/2026/files/index-table-2026-mid-year-update-.xlsx and the message

this is what I get back each time and I have never had this happen before:

Server Not Found

Firefox can’t connect to the server at s3.us-east-1.amazonaws.com. What can you do about it?

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

Sir, Unable to connect

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

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the web.

Note:- I have connected my pc with wifi .Kindly solve the issue please.

Firefox Nightly for Android

After one of recent update (few weeks ago) cannot access local network ip addresses.

Tried different suggestions from SO in about:config but nothing helps.

Other browsers works.

I have been using Firefox on my iPhone for years without problems. But for about a week now if I’m on data it can’t load any websites, a message appears saying it cannot connect to server. It works fine when I’m on WiFi.

For the last year or so, and not consistently, Thunderbird will not bring in new imap messages across multiple accounts. Sometimes closing and reopening will make new messages appear. If I close Thunderbird from task manager and reopen it always brings in new messages. When it does start working it will keep working for 1-3 days. Restarting my computer seems to make it work for longer. Running Win 11 Pro, but have the same issue on a Win 10 Pro computer, different antivirus on each computer. Seems to be the same issue as this post https://www.reddit.com/r/Thunderbird/comments/1gxduxt/thunderbird_not_showing_new_messages_unless_i/

Hello community,

at my place of work no one can send or receive mail anmore using Thunderbird. The problem suddenly appeared last monday. No changes regarding the network or settings in Thunderbird happened prior to this.

Here's what I tried so far and things I can rule out:

• same problem appears on all devices (desktop and laptop PCs) in our office
• our work mail server is online and working, I can access everything using the webmail-interface in the office network
• new installation of Thunderbird without any profiles and fresh account confguration doesn't solve the problem
• I can connect to our mail provider and send and receive mail when using my home network or my personal phone hotspot
• I can connect to my private mail provider using Thunderbird while in the office network
• troubleshooting mode doesn't solve the issue
• renewing the internet connection on our router temporarily/once allowed some devices to receive mail
• pinging the mail server (mailserver.[workdomain].de, no specific port) via command line was successful while Thunderbird was unable to connect to the mail accounts

IMAP-Log returns the following error codes:

• D/IMAP URL failed with code 0x804b000e
• D/IMAP URL failed with code 0x804b001e

I would be glad if somebody could help me out. If you need any more details I'll provide them. Thanks in advance!

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Afterward no mail is being received from any of the providers, everything is stopped at last time I connected before the error, i.e. 7/9/2026

No matter what site I try to load or search it says unable to connect firefox cant connect to server at ( whatever site this could be google yahoo or other sites not just search enjoins , anything I try ) Under this it says what can I do about this and gives me a few options. The problem I think had to do with firefox not being able to connect or no longer having permission to the web. I can connect to everything if I use another browser it’s just fire fox and it happened randomly. It was fine until it wasnt please help I want to use fire fox

Today (7/11/26) Mozilla VPN began blocking all access to the Internet. When I turn it off, I can connect. When I turn it on, I can't. Am I the only one? So far I have:

• Reset the app
• Uninstalled all WAN network adapters and restarted (I notice for the first time that Mozilla Tunnel appears in the list after doing this)

It is interesting to note that Proton free VPN which I installed as an experiment, and ran with Mozilla VPN entirely off (system tray quit as well) also blocks all Internet traffic. So it could be one of those Windows update issues. This afternoon, all was well. I turned off my machine, turned it back on, and no browsing can happen with either VPN on.

Normally, Mozilla VPN works flawlessly, so I have no complaints--it's only a technical mystery to unravel.

Best regards, C. Crowley