Yonke imikhiqizo Community Forum

Hei!

I have used firefox.localhost to test my html page containing some JavaScript.

Now suddenly (it has worked nicely many times) it claims that there is not connection:

I also tried the "BlueFox" (developer version) and the response was exactly the same.

Firefox was just yesterday updated. OS is Windows 11.

W.b.r:

Jarmo Alander

jal.t.alander@gmail.com

Here the response text:

" Unable to connect

Firefox can’t connect to the server at firefox1.localhost 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

For the pas 2 mouths i am getting random: "Server Not Found.Firefox can’t connect to the server at" It is happening on random sites that i know for sure they are not down... Waiting , closing fire fox and open it again, refresh but after waiting... helps.

My Firefox on a Linux system only connects to my gmail acount. Any other attempt to connect to sites gives the msg Can not connect to Server. Do I need to reset something? Or reload the Linux system. Thanks Graham Benson

I have Thunderbird configured to log in to 3 separate email accounts, one of which is a Yahoo email account. Several days ago, a message appeared that notified me that Thunderbird would not connect to the imap account in Yahoo. I tried changing the password by logging in to the Yahoo account via my browser, but Thunderbird still gives the error message. Do I need to delete the Yahoo account from Thunderbird and start over, or is there something else that can fix Thunderbird so I can use it for all 3 email accounts? Thank you.

I'm confident that this is not a Spectrum/Charter issue as I can log into their webmail client and send mail. I can also use the Mail app on my iPhone and send mail from my user@san.rr.com account. My settings are below and have not changed in many months (when SMTP was still working). I've also checked "Saved Logins" and verified that there are entries for IMAP and SMTP and that the password for both is the same and is correct.

Description: IMAP Mail Server Server Name: mail.twc.com Port: 993 User Name: user@san.rr.com Authentication method: Normal password Connection Security: SSL/TLS

Description: TWC SMTP Server Name: mail.twc.com Port: 587 User Name: user@san.rr.com Authentication method: Normal password Connection Security: STARTTLS

This issue started last week on my Windows 11 PC (which has had updates paused since last month). I was previously using TB 128 and have subsequently updated to 140 and repaired my inbox trying to find this issue. When I attempt to send a message, I see "Status" Sending Message..." and a blue progress bar that never changes (TB_sending.png). The dialog box remains frozen for multiple minutes. I had seen a connection error message to SMTP in the past, but it usually disappeared the same day (see other screenshots). It feels like TB is not making a good STARTTLS handshake with mail.twc.com. I've tried switching to SSL/TLS port 465 and that has the same issues.

I downloaded the version on the site but I can't get it to accept my password all I get each time is this at the top of the box

Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIIOService.newURI]

Just how am I supposed to understand what that means. I would be grateful for any help you can give I've been using Thunderbird for over 25 years without any problems, I had to reinstall Windows and now I've got this problem.

Recently I posted about this problem here: https://support.mozilla.org/en-US/questions/1580858 In sum, I was having problems both in downloading messages from the Spectrum server and also with sending messages. I've attached screenshots of the error messages.

Matt and David kindly posted some helpful responses. The problem then seemed to spontaneously solve itself and I breathed a sigh of relief. Then a few days later it re-appeared.

This time it's not quite as bad in that I'll get the error messages but then usually a few minutes later I can download the messages or send an email. But it's still a real problem.

I called Spectrum again and this time the rep was adamant that if I can still use the Spectrum webmail feature (and I can), then it's not a Spectrum issue.

Last time Matt asked about my antivirus. I use Windows Defender (and occasionally do a manual scan with Malwarebytes free version), so if I understood him right, I should be OK as far as antivirus interference.

Matt also suggested I set TB so that I download messages at startup and every 15 minutes. I was set to every 10 minutes so I changed it to 15.

Matt said for me to check the Activity Manager. I've attached a screenshot of what that showed a few minutes ago. But I should note that this was after an error message displayed but my email downloaded anyway.

Finally, Matt said I should check the Error Console (Control + Shift +J). I've attached a screenshot of that. He also said I should use the trash can to clear it, so I did. He then said to press Shift + F5 to attempt to get my messages. But on my laptop, F5 just dims the display so no dice on that. But I have a second laptop and F5 is "neutral" on that one so I tried it there. I didn't get any new error message.

However, one of the screwy things is that sometimes I get all my messages as normal, but only after the "Can't connect to the server" message displays. And that's what happened with my second laptop above.

I hope I've provided better info. this time. And I hope you gents can help me with this mess.

Thanks,

Andrew

Thunderbird suddenly stopped working properly today, 15 September 2026. Webmail for the same email account is working normally: I can both send and receive messages. However, Thunderbird is having problems with both incoming and outgoing mail. • Thunderbird connects to the IMAP server, sometimes very slowly, but then does not retrieve new messages. • Sending a message from Thunderbird fails because it cannot connect to the outgoing SMTP server. • Thunderbird's own update also fails. This has never happened to me before. • I have restarted Thunderbird and also restarted the Mac, but the problem remains. • I have not changed any Thunderbird account settings. The fact that webmail is working normally makes me wonder whether this is a Thunderbird problem rather than a problem with the email service. Has there been a known Thunderbird problem affecting connections to mail servers or the Thunderbird updater, and could these problems be related

Almost anything I try to do with Thunderbird, even replying to emails requesting advice, I come up with errors, such as:

Sorry, you have been blocked

You are unable to access thunderbird.net

upstream request timeout

upstream connect error or disconnect/reset before headers. reset reason: connection termination

The Firefox built-in VPN option appeared for me about a week ago, maybe two; I don’t know whether it only just reached me in the rollout, or whether Firefox highlighted it because of the “more bandwidth” promotion. Either way, I activated it. But then, three days ago, I noticed that my browsing was no longer going through a VPN, and that the VPN settings had all disappeared from Firefox.

I’m in Australia. I’m signed into my Firefox account. I’ve tried signing out and back in; restarting this device; and doing as many steps from the Support article “Unable to find the built-in VPN in Firefox” as I could, given that it gives instructions for desktop Firefox, not Android. In particular, I removed one study—not the one named in the article, but a different one with “holdback” in the name (something like “long term holdback H1”).

Any time I try to load a webpage on Firefox, I get the error which states "Firefox can’t connect to the server". This occurs when the DNS over HTTPS setting is set to 'off' or 'default'. When the DNS over HTTPS is set to 'custom', the error displayed is "Firefox can’t protect your request for this site’s address through our secure DNS provider. Here’s why: Firefox wasn’t able to connect to firefox.dns.nextdns.io." (it's the same for next DNS or cloudfare).

When I initially opened the DNS over HTTPS settings, this message was displayed: "DNS over HTTPS is not working because we encountered an error (NS_ERROR_CONNECTION_REFUSED) while trying to use the provider Cloudflare". However, this message went away and I have not been able to replicate it.

I have already tried everything suggested in the support article "Firefox can't load websites but other browsers can". I do not have any antivirus software installed. I reconfigured the proxy settings to no proxy. I changed the IPv6 settings. I changed the DNS Prefetching settings. Nothing has worked.

Safari works perferctly fine, Chrome is giving me similar errors.

Sorry about the incorrect location with my last question. Unfortunately the VPN has just disappeared. I have no idea and done nothing to the settings. If anyone could please help, it'll be greatly appreciated. *Bows*