On 06/23/2018 15:47, Ralph Fox wrote:
On Sat, 23 Jun 2018 15:06:15 -0500, none wrote:

https://mywater.kcmo.org/cus/mcuslogin.jsp

No error here in IE or Firefox.

Check Pale Moon's certificate store to see whether it has the right
CA certificates.

As far as it goes you were right-it doesn't.

I went and did some more homework. Pale Moon throws an error because
the site doesn't send the intermediate certificate that it's supposed
to, which leaves the certificate chain incomplete. You didn't see that
in Internet Explorer because IE supports Authority Information Access
fetching-it grabs the missing cert from the CA to complete the chain.
Firefox and Pale Moon (which is forked from Firefox) don't support AIA
(another childish spat between alternative browser and website
developers that leaves end users in the lurch and drives more and more
of them back to IE).

Anyway, I was able to manually retrieve and install the cert by looking
at the AIA URL on the certificate. Now I can pay my water bills online
again.

Thanks, Ralph for trying to help.