to me it looks like you hit a HTTPS server with a certificate that is not the currently valid SUSE one.
Have you tried running SUSEConnect from the command line, i.e. with “–debug”? That way you could probably see what server URL is being contacted. We could then check if that server actually uses a bad/wrong certificate, or if it is something related to your site. Do you connect across a proxy?
If it turns out to be some problem with the server certificate, and you could definitely make sure you are contacting the right server, you could create a file /etc/SUSEConnect (see the *.example version there) and turn off the SSL certificate check. But I only recommend this as a measure of absolutely last resort, because you’re turning of security then: You might be connecting to a “bad” (non-SUSE) server, i.e. a DNS spoofing attack or else, and never find out.
If you cannot debug this further, I recommend to contact SUSE to open a support request.