Firefox Community Forum

Trying to print UPS labels and I get the error message: Unable to connect

Firefox can’t establish a connection to the server at 127.0.0.1:4349.

Printer worked on 4/24/2025

I can't log into my bikejournal.com site I get an error message - 500 - Internal server error It says to enable cookies on browser. I don't know how to do this. I have been using this site for years and even used it last week but now I am not able to log in

I installed Firefox on a new steam deck. The device comes with an icon to download and install the browser. steam''' I get a 500 error when I try to log in. The login page never appears.

I am getting this error message in Firefox when attempting to open site however can access site in Chrome. I have closed adblockers and cleared SSL cache. If it matters I am using a new Notebook with Windows 11 and have recently installed Firefox and it was working up until today

Hi there, I am trying to go to a site that I go often, but getting this message back - "502 Bad Gateway openresty". That happens once in a while, I can generally access the site without problems,. What should I do? thanks

Hi

When I browse to https://earthobservatory.nasa.gov/images/154162/clouds-hover-over-the-alaska-peninsula, I can play the shown video once.

When the video is about to start the 2nd time though, the log from the web developer tool says (see screenshot): ``` Media resource https://eoimages.gsfc.nasa.gov/images/imagerecords/154000/154162/ak_cloudwave_vir_20250407_anim.mp4 could not be decoded. clouds-hover-over-the-alaska-peninsula All candidate resources failed to load. Media load paused. clouds-hover-over-the-alaska-peninsula Media resource https://eoimages.gsfc.nasa.gov/images/imagerecords/154000/154162/ak_cloudwave_vir_20250407_anim.mp4 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) Details: virtual RefPtr<MediaDataDecoder::DecodePromise> mozilla::GMPVideoDecoder::Decode(MediaRawData *): mGMP not initialized ``` and the video shows the warning "No video with supported format and MIME type found.", although the video was successfully played the 1st time.

Note that the first four warnings in the screenshot already appear when loading the page, i.e. before playing the video the 1st time.

The same happens when all installed firefox plugins are disabled.

I am using firefox 137.0.1 (64 bit) on arch linux.

Thanks for help, Chris

Secure Connection Failed

An error occurred during a connection to oidc.idp.clogin.att.com. PR_END_OF_FILE_ERROR

Error code: PR_END_OF_FILE_ERROR

I'm unable to update Mozilla Firefox using apt due to the following error:

E: Failed to fetch https://packages.mozilla.org/apt/dists/mozilla/main/binary-amd64/Packages 400 Bad Request [IP: 34.160.78.70 443]

While troubleshooting, I found that the request does return the package list, but with a 400 Bad Request status, which causes apt to fail.

keep getting blocked on websites that used to work.

www.uhc.retiree.accounts.com

Get response from https:cashnow An error occurred during a connection to cashnow.com. PR_CONNECT_RESET_ERROR

There is an Ad Blocker AVG that I can not get rid of. Frank

I have been using my Firefox browser to access my PSECU bank account for years. Over the past two months I cannot access the online bank statement getting a 404 message. I've contacted the bank and they say the issue is not with them but with Firefox. What can I do?

Problem:

       Firefox 137.0.1 on Ubuntu 24.04 fails to load vencord.dev with PR_END_OF_FILE_ERROR

       Other browsers (Chrome, curl) work fine

       Same error in Safe Mode

   What I checked:

       SSL cert is valid (openssl shows no issues)

       Reinstalled Firefox completely

       Reset profile, updated CA certs

       No extensions installed

   Technical details:

       TLS_AES_256_GCM_SHA384 cipher

       ECDSA-SHA256 signature

       Verification shows OK (code 0)

   Need help with:

       How to debug this specific TLS termination

       Where to find relevant Firefox logs

       Known issues with Firefox 137 and ECDSA

   Can provide:

       Full openssl output

       Firefox debug logs

       Packet captures if needed

   Quick test:
   curl works:
   curl -v https://vencord.dev
   Firefox fails even in headless:
   firefox --headless https://vencord.dev

   Tried forcing TLS 1.2:
   NSS_SECURITY_ARGS="version=tls1.2" firefox https://vencord.dev
   Same error

An error occurred during a connection to dss.bhata.gov.bd. SSL peer was not expecting a handshake message it received.

Error code: SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT

When I try to log into ssa.gov I get a Bad Request error. Every time, no matter how I access the website. Only have and use FireFox on my Windows 8.1 desktop computer with Malwarebytes. No problems with other sites. I've read what seemed relevant to my question on this forum, but nothing seems to fit. Thanks, Bernadine

I have recently installed Windows 10 IoT Enterprise LTSC 21H2 build 19044.5737 I am getting following error while surfing some web sites using Firefox latest version. There is no problem with MS Edge.

Looks like there’s a problem with this site

https://linkos.store/qSL9d4V7uDUy2Z9s/1/953 might have a temporary problem or it could have moved.

Error code: 520

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

Thanks in advance

I keep getting this error every time I open a new tab.

Secure Connection Failed An error occurred during a connection to www.google.com. PR_END_OF_FILE_ERROR Error code: PR_END_OF_FILE_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.

But then disappears when the page is refreshed.