Getting "Secure Connection Failed" message from all websites
I started to receive error messages when trying to access websites about a week ago. It only seems to be an issue with Firefox and doesn't appear on other browsers. I'm using Firefox version 92.0. I've had these messages appear:
"PR_END_OF_FILE_ERROR" (most common message)
When I click "Try Again" it will connect to the website, but it always fails to connect on the first attempt. This happens on every website, including Mozilla Support. I tried deleting browser history, refreshing Firefox in troubleshooting information, and uninstalling and reinstalling. Still getting the "Secure Connection Failed" messages.
I tried following some other threads about possible fixes (I'm not well versed in computer troubleshooting). I went to About:config and checked "security.enterprise_roots.enabled", which was set to true. I tried going into the Profile Folder and deleting the "cert9" file, which made no change. I have Avast Anti-Track, and found that it was disabled for Firefox. However neither enabling it or disabling it seemed to make a difference.
Is there anything else I can try to resolve this issue?
radi.stoyanov said Turns out the option DNS over HTTPS is what caused the problem.
jamesafuf123 said https://support.mozilla.org/en-US/questions/1264659#answer-1237475 my ISP was blocking sites like that
cor-el said This usually means that Firefox wasn't able to find a cipher suites to use to connect to this server and reached the end of the list. There can be two possibilities: one is that the server is outdated and doesn't support modern cipher suites, another might be that the server only supports a few cipher suites and Firefox doesn't support any of these.
You can check your browser and possibly compare this with the server setup. https://www.ssllabs.com/ssltest/viewMyClient.html
ssl_error_rx_malformed_alert https://support.mozilla.org/en-US/questions/1024043 I used the malwareBytes' Anti-Malware, and it worked perfectly, it solved my Problem . .
SSL_ERROR_RX_UNEXPECTED_APPLICATION_DATA https://support.mozilla.org/en-US/questions/1169369 In short, the problem is broken support for TLS1.3 in the corperate middleware.
A workaround is: 1. Go to about:config 2. Find setting 'security.tls.version.max' 3. Change value from '4' to '3'. ++++++++++++++++++++++++++++++++++++++++++++++++++++ There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.
What security software do you have?
This could be a problem with Avast Anti-Track, so if you use this software then try to disable it.