The code PR_CONNECT_RESET_ERROR indicates that the web server or an intermediary, such as a firewall or router, terminated the connection attempt (TCP code RST).

This could occur because Firefox shared its preferred connection parameters and the server doesn't support them. When I check the following test page, both Firefox and Safari are rejected by the server:

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

And the test site considers their ciphers "weak."

Does the site deal with important information? If so, I suggest sharing that link with them to investigate (and hopefully beef up) their configuration.

The code PR_CONNECT_RESET_ERROR indicates that the web server or an intermediary, such as a firewall or router, terminated the connection attempt (TCP code RST). This could occur because Firefox shared its preferred connection parameters and the server doesn't support them. When I check the following test page, both Firefox and Safari are rejected by the server: https://www.ssllabs.com/ssltest/analyze.html?d=rotary.vsgdover.com And the test site considers their ciphers "weak." Does the site deal with important information? If so, I suggest sharing that link with them to investigate (and hopefully beef up) their configuration.

Thank you for this information and that website, I'll definitely bring it up to them because yes it does deal with important information. Is there any way for now to just tell firefox that this site is ok and let me connect to it?

Is there any way for now to just tell firefox that this site is ok and let me connect to it?

Firefox isn't rejecting the site, the site is rejecting Firefox. I don't know whether there is a workaround for that.

Firefox isn't rejecting the site, the site is rejecting Firefox. I don't know whether there is a workaround for that.

Understood. Thank you again for the help and quick answers.