Firefox Community Forum

I try to connect to a web site but I get this response:

"Secure Connection Failed An error occurred during a connection to help.wned.org. Cannot communicate securely with peer: no common encryption algorithm(s). Error code: SSL_ERROR_NO_CYPHER_OVERLAP

   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."

"

An error occurred during a connection to portal.esic.gov.in. SSL received a record that exceeded the maximum permissible length.

Error code: SSL_ERROR_RX_RECORD_TOO_LONG

   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.

Greetings.

Several times today I have had messages not sent because of this error message: "Did Not Connect: Potential Security Issue". I am sending political messages and am concerned that Mozilla is blocking me. I have sent hundreds of similar messages over the years with no problem.

What's up now?

Thank you. Sincerely, Gail Forrest

I am trying to log into a "http" website forum, of which I am a member and I am unable to do so, I think due to my Mozilla and or DuckDuckGo "Settings". If at all possible, I would like to reset my browser settings, so that I am able to rejoin this forum. A step by step reply would be much appreciated, because I am not a fluent user/programmer! This is the "Error" that I am consistently being shown: "Secure Connection Failed An error occurred during a connection to www.motoscrubs.com:80. SSL received a record that exceeded the maximum permissible length. Error code: SSL_ERROR_RX_RECORD_TOO_LONG The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the web site owners to inform them of this problem." The forum website does not use the "https" address as it does not trade and the extra cost for this type of domain would be prohibitive to its continued maintenance. Thank you for your time. BillR

I have an website which I prior to this error message have visited many times on Firefox and had no problems. Recently though around two days ago I noticed that I couldn't get in and was met with the following message "Warning: Potential Security Risk Ahead". I can't bypass it apparently and I really need to be able to access this site as it's a University site.

I can access the site on other browsers such as Chrome and Edge but I use Firefox as my default browser and I'd like to keep it that way. I'd appreciate any help I can get.

Said link: https://canvas.gu.se/

Secure Connection Failed

An error occurred during a connection to searchingswift.com. SSL received a record that exceeded the maximum permissible length.

Error code: SSL_ERROR_RX_RECORD_TOO_LONG

   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.bold text'

Hello,

I am in a situation where I am a student at the university of Gothenburg. At the university the students have their own spaces at a cyberspace cloud storage facility. The place is called Canvas. In Canvas the students subject are lined up and information about each subject is also stored and other features about the students education. The place is only about university information and education. Yesterday, I tried to log in to my account into Canvas at the university of gothenburg, at Handelshögskolan on my computer. It was not a success. I tried to use the regular webbrowser for Apple, Safari, but it was not a problem there and I was able to login. I was also able to login to my account on my cellphone, which is logged in via an application downloaded from Appstore.

I do not wish to use Safari because it is not purposeful in the usage in the direction via education that i am looking to achieve.

How can you help me solve this please?

Hello, I run a movie and drama-related website: https://tvmon.com.co/. Recently, I’ve noticed that Firefox occasionally throws the following error when trying to access the site:

"Secure Connection Failed An error occurred during a connection to tvmon.com.co. . The OCSP response contains an invalid signing certificate. Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT"

This issue is very strange because:

1. The site loads fine in Chrome, Edge, and Safari.

1. My SSL/TLS certificate is valid, up-to-date, and passes external tests (SSL Labs, etc.).

1. The error only appears occasionally in Firefox, refreshing sometimes fixes it, sometimes not.

1. Hosting and server logs show no issues at all.

I suspect this is related to Firefox’s stricter OCSP validation, but I’m not sure how to debug or resolve it. Since my site streams drama and movie content, this error is frustrating for users who rely on Firefox.

Has anyone else experienced this intermittent OCSP signing certificate error? Is there a known fix or workaround for Firefox-specific validation issues?

I get the "Secure Connection Failed" when trying to go to a web site.

I know the web site is fine. You have stopped offering the "Go anyway" button!

https://thebougainvillahouse.org/

... it's a 503 charity we give money to.

Fred

And when I say every website is blocked, EVERY website is blocked. Google was blocked. Duck, Duck, Go was blocked. MOZILLA.ORG WAS BLOCKED!!!!! And all for “Potential Security Issues.” My laptop is essentially useless because your fucking program won’t let me connect to ANY website. Im going to have to uninstall it so I can use my computer. Yes, my computer clock is correct. What the actual fuck is going on?

My anti-virus reports that 30 to 100 times per day, it blocks firefox.exe attempts to establish a connection relying on an expired certificate to to www.temu.com. Can you please stop your attempts ? Or tell me how to stop them ?

Why am I constantly getting the following message from Bitdefender every time I log into Firefox - "firefox.exe attempted to establish a connection relying on an expired certificate to tracker.ads-radiantfusion.co. We blocked the connection to keep your data safe since websites must renew their certificates with a certification authority to stay current, and outdated security certificates represent a ...." Please let me know if it is safe to exclude this warning. Best Regards, Mrybos

Bitdefender security software Online Threat Prevention "Notifications" are blowing up stating the following: "firefox.exe attempted to establish a connection relying on an untrusted certificate to incoming.telemetry.mozilla.org"

The issue began approximately 17:00 UTC November 16, 2025

Please investigate & update the certificate or we may need to move to a different browser.

Screenshot submitted.

D.

How do I get the site to load when I KNOW the website is secure. This happens too, too often! I really don't want to have to use a different browser.

Please... FIX THIS!!!

Secure Connection Failed

An error occurred during a connection to www.netacad.com. The OCSP response is not yet valid (contains a date in the future).

Error code: SEC_ERROR_OCSP_FUTURE_RESPONSE

   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.

Secure Connection Failed

An error occurred during a connection to insights.lfx.dev. Cannot communicate securely with peer: no common encryption algorithm(s).

Error code: SSL_ERROR_NO_CYPHER_OVERLAP

   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.