kevinf99 wrote:These userIDs and passwords are not encrypted while SSL/TLS (https...) are not allowed.
An expired certificate doesn't mean that SSL is not used. With an expired certificate the traffic is still encrypted and is still secure as long as the server's private key has not been exposed.
An expired certificate only means that the certificate authority hasn't rechecked that the certificate is still in possession of the certificate owner of record. With smaller organizations that could be a significant consideration. But with the church there isn't much chance that they have lost control of the domain. And there isn't anybody who recently had the domain that could be using their own expired certificate to pose as the church.
So as long as you make sure the certificate you are overriding is really for the right server, then traffic is still secure.
But they really should fix it soon. It's never good to train people to click past security warnings. If they get used to it, they're more likely to missing a real security risk whether on a church server or someone else's.