Cups Untrusted Connection

[Atip]

I am trying to access the forum of cups.org in order to report that I can't print
with the the latest version of cups-1.6.1 since no filters are found.

However, when trying to access the website I get:

This Connection is Untrusted

You have asked SeaMonkey to connect
securely to cups.org, but we can't confirm that your connection is secure.
Normally, when you try to connect securely,
websites will present trusted identification to prove that you are
going to the right place. However, this website's identity can't be verified.

What Should I Do?

If you usually connect to
this website without problems, this error could mean that someone is
trying to impersonate the website, and you shouldn't continue.

I get this warning with firefox and dillo as well.

My question, how serious is this and why from a site of cups?

Should I continue and disregard the warning?