Do you still get this error when you try to connect like:

/server 6667

I still have no problem connecting, other than using +6697 instead of 6667 requires that I change options/connect/options/SSL for "server certificate" to "display invalid certificate or approval" because they created their certificates incorrectly by not including as one of the domains owned by the certificate.

You can try using their webchat interface at their website then click on "chat now", then try to join #help