Problem posting to WP forums: secure connection error messages

Lately I’ve often (but not always) been getting a Secure Connection error message when I post or reply to a thread on these forums, as if there is an outdated security certificate. If I “Try Again” and “Resend”, the message gets posted.

I’d assumed it was some quirk of my own system, but now I’ve been getting it from two different locations/networks/operating-systems altogether.

Any idea what the problem might be, or how to supply better information for anyone to be able to figure out what’s going on?

Here’s the exact woding of the error message:

Secure Connection Failed

The connection to the server was reset 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.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites

And yes, I’m using Firefox in all cases.