Firefox Community Forum

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/

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

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 ?

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.

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.

At your recommendation I signed up to Ad Avoid and now FireFox tells me that I could/should not access BT.Com because of the certificate issued by Ad Avoid

I am subscribint to TheHybridLayer.com and the video requires access to player.vimeo.com. Unfortunately, the pop up message is saying that "Did Not Connect: Potential Security Issue." Please help me address the issue since I overwhelmed with this.

Current situation : I am using Macbook Air 11" 2015, MacOS Catalina, Firefox 145

i'm not connecting to my web site www.kroger.com something has me blocked . i tried everything to get in the message says secured connection failed . i called kroger stores and they said it is an internet problem .

Secure Connection Failed An error occurred during a connection to mail.yahoo.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. Learn more…

Try Again

Firefox blocked your visit to this site because the certificate provided for agents.shohoz.com has been revoked and isn’t trusted anymore.

Error code: SEC_ERROR_REVOKED_CERTIFICATE

View Certificate

Today when I try to access my Yahoo mail from www.yahoo.com, encountered Potential Security risk. Is this a problem encountered by others as well ? I still looking on how to report the issue to FireFox.

https://www.aiou.edu.pk/

This website not open

issue

Warning: Potential Security Risk Ahead

On some of my accounts that I use every day I keep getting unsecured site and can't advance to my site. Michales is one of them so I can't use my coupons to buy my products.

Running Surfshark on Windows 10 or 11 and Unbuntu 24.04. Some sites and attachments giving error failures. Happening with Firefox and Edge. Need troubleshoot source.

"Secure Connection Failed

An error occurred during a connection to forkliftgrocery.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."'

Attachment error.

please provide directions for fixing the navigating inside NEwsmax site

Secure Connection Failed

The connection to www.newsmax.com was interrupted while the page was loading.

   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.