Firefox Community Forum

Did Not Connect: Potential Security Issue Firefox detected a potential security threat and did not continue to www.youtube.com because this website requires a secure connection. What can you do about it? www.youtube.com has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site. The issue is most likely with the website, and there is nothing you can do to resolve it. If you are on a corporate network or using antivirus software, you can reach out to the support teams for assistance. You can also notify the website’s administrator about the problem.

Hello, thank you for taking the time to read my request. I am a long-time user of Firefox, but recently I have encountered a series of bugs.

1. Initially, I couldn't access GitHub. On the same computer, Edge works fine, but Firefox fails to load the page. Sometimes, the page content loads in Firefox, but the layout is completely messed up, leading me to suspect that CSS files are not loading.

2. I uninstalled Firefox, deleted the profile, and performed a complete reinstallation. This time, I couldn’t even open the Firefox account login page, receiving the error `SSL_ERROR_BAD_MAC_READ`.

3. Following online advice, I set `security.tls.version.max` to 3, but the issue persisted. The error changed to `SSL_ERROR_RX_MALFORMED_SERVER_HELLO`. When checking the certificate, the common name was `n.sni-347-default.ssl.fastly.net`.

4. Suspecting an issue with the system or browser certificates, I deleted all self-signed certificates and self-signed CAs (such as Fiddler and Accesser) from the system, but I still cannot access the site.

Please tell me, how should I go about solving this problem?

您好，感谢您在繁忙之中拨冗阅读我的求助。

我是Firefox的老用户，但最近发生了一系列的bug。 1. 最初是github无法访问。在同一台电脑上，用Edge可正常访问，但Firefox无法访问。Firefox有时页面内容可正常加载，但布局全乱，怀疑是CSS文件未加载。 2. 我卸载Firefox，删除配置文件，完全重装。这次连火狐账号登陆页面都无法打开，提示SSL_ERROR_BAD_MAC_READ。 3. 我按照网上的提示，设置`security.tls.version.max`为3，仍然无法加载，报错变为`SSL_ERROR_RX_MALFORMED_SERVER_HELLO`。查看证书，通用名称为`n.sni-347-default.ssl.fastly.net`。 4. 怀疑系统或者浏览器证书有问题，删除了系统内所有自签名证书与自签名CA（fiddler, Accesser）但仍然无法访。

请问我该如何解决这个问题呢？

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?

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'

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/

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?

It seems lately that about 40-60% of the links I click on do not work while browsing on Firefox. Most of these are links from trusted sources, many from subscriptions services I'm paying for, and thus unable to gain access to. I will get an error message saying something like "secure setting failed," or something similar (see attachment). Is this something new added to Firefox for added security? And I read some solutions in the settings area, but it seems like most of them can't be bypassed. It's very frustrating because many of these links have valuable info or tools that I can't access. Do you have any advice other than to contact the sender (which rarely results in a solution)? Thank you, Paul Fernandes

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

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

An error occurred during a connection to ezproxy.yu.edu.jo. PR_CONNECT_RESET_ERROR

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.

Learn more…

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.

Hello, This is Fr. Sakala, a Catholic priest. I have been trying to re-log in a regular site, hyella.com.ng, but could not access it.

I know it is a very secured and delicate site, but help me log in. Thanks!

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."

"

When I try to access the Newsmax website, I get a black screen with the message which says,

"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." 

I have no problem accessing other sites, so what can I do to get the resolved?

when I go into firefox and enter my password this is what I see.

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.

Did Not Connect: Potential Security Issue

Below mentioned issue occuring ???

Firefox detected an issue and did not continue to finance.jharkhand.gov.in. The website is either misconfigured or your computer clock is set to the wrong time.

It’s likely the website’s certificate is expired, which prevents Firefox from connecting securely.

What can you do about it?

finance.jharkhand.gov.in has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site.

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.