Here’s how I attempt to set this up on my iPhone 7+ with iOS 13.1.2:
- Go to Passwords and Accounts
- Select Add Account
- Select Other
- Select Add CalDAV Account
- For Server, enter blackholeinc.net/remote.php/dav/principals/users/josef/
- For User Name, enter josef
- For Password, enter my password (with which I can log into the website from Chrome on Windows)
- For Description, enter BHICAL
- Select next
- Wait while the phone says “Verifying”
- Get this pop-up: “Cannot Connect Using SSL. Do you want to try setting up the account without SSL?”
- Select Cancel
- Get this pop-up: “Calendar Account. Unable to verify account information.”
- Select OK
- Select Advanced Settings
- Verify that Account URL says “https://blackholeinc.net/remote.php/dav/principals/users/josef/”
- Verify that Use SSL is selected (green)
- Type 443 for the Port
- Go back to Caldav
- Select Next
- Get the same pop up as Step 11.
- Hit cancel
- Get the same popup as step 13.
- Recheck Advanced settings. They’re still the same as 16-18.
- Hit Save, on the off chance that it will work.
- It warns me it may not work.
- Go to the Calendar App
- Select Calendars
- Surprise - I see my calendar.