There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

Websites don't load - troubleshoot and fix error messages

http://kb.mozillazine.org/Error_loading_websites

What do the security warning codes mean

Hi websitefun, I submitted the domain here:

https://www.ssllabs.com/ssltest/analyze.html?d=vfsolutions.com&latest

It shows that none of their Firefox test systems could connect. I believe it is because the list of ciphers is too restricted. You can view the ciphers supported by Firefox if you visit the following page in Firefox:

https://www.ssllabs.com/ssltest/viewMyClient.html

So for example, the server supports:

TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028) TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027)

Firefox doesn't support CBC in this configuration. Try adding these ciphers to your server configuration:

TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030) TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)

As a point of comparison, my web host went to TLS 1.2-only last year, and only supports four ciphers but shows the ability to connect to all of the test browsers:

https://www.ssllabs.com/ssltest/analyze.html?d=jeffersonscher.com

Not sure how they chose those ciphers.

hi jscher200 - thanks for information I am working to get the ciphers added so I can test will let you know if problem is resolved