I´m using nextcloud calenders with SSL now. After inserting the correct data in the iPhone, my calendars are displayed for 1 second, then they are gone. Before the use of SSL, it worked fine … Does anyone know the problem?
Which Certificate do you use?
I use Let´s Encrypt
Maybe its a problem of the calendar app itself.
Did you delete your account and add the https-Account as new account, or did you change your existing http-Account to use ssl?
Does service discovery work (visiting https://your.nextcloud.tld/.well-known/caldav should ask for user credentials and then return „this is the WebDAV interface…“)?
I don’t think it is a problem of the calendar app itself, because I use caldav on iPhone with Letsencrypt without any issues.