A while back, the issue of needing a wildcard certificate (not supported by Lets Encrypt) for EZProxy was discussed.
In my discussions with publishers about switching to HTTPS, EZProxy compatibility has been the most frequently mentioned stumbling block preventing a complete switch to HTTPS for some HTTPS-ready publishers. In two cases that I know of, a publisher which has been HTTPS-only was asked by a library customer to provide insecure service (oh the horror!) for this reason.
It's been pointed out to me that while Lets Encrypt is not supporting wildcard certificates, up to 100 hostnames can be supported on a single LE certificate. A further limit on certificates issued per week per domain would mean that up to 500 hostnames can be registered with LE in a week.
Are there EZProxy instances out there that need more than 500 hostnames, assuming that all services are switched to HTTPS?
Also, I blogged my experience talking to people about privacy at #ALAMW16.
President, Free Ebook Foundation
Founder, Unglue.it https://unglue.it/