Your comments

Is there a guide to adding a certificate? If that solves my issue I'll do it

Thank you. I hope this is investigated and addressed at some point.

Thank you sadly, this does not work, even though the existing connection is sitting there, taunting me.

Here’s what I’m wondering. Is it possible that the “Apple Transport” security check is now causing this to fail? I believe this is a requirement that was part of an update a few months ago. If so, my existing connection may be working because it was already existing and there is no check, if that makes sense. Reference based on a similar situation:

https://community.produktstudio.com/t/calibre-opds-doesnt-work-when-login-details-are-required/1028

Great news, Tom!

Hi are you aware that you need to open that port in the port forwarding section of your router?

I should report that my app started to work again after I deleted it and set things up again. Not sure if there was a database problem or what

Chunky appears to broken now, to me at least. I had no problem, however, using (URL or IP address):(Port) and then username and password