Can't sync CalDav/CardDav

Hi,

Im hosting my own Nextcloud, this is behind an Nginx docker with letsencrypt.

If I browse my nextcloud url the certificate looks fine, I have no problem syncing my calendar and contacts on my android phone.

Today I got my 13 Pro (my first iphone since 4s).

When I try to setup an CalDav account it complains about the certificate and looking at the details the certificate for my Unifi router is showed and not my Nextcloud certificate.

Why doesn't this work on the Iphone when it work from web browser and android and how can I fix it?

Posted on Nov 15, 2021 5:12 AM

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CalDav not working with Let's Encrypt certificate or Synology DSM anymore? For quite a while I have been using a CalDAV calendar hosted on my private Synology NAS. A few days ago (beginning of August?) accessing this calendar by my iPhone (iOS 15.6) stopped working, whereas accessing it by Thunderbird still works. This means: DSM calendar itself is still working fine. I've already deleted the calendar account on my phone and tried to recreate it, but iOS says it can not connect by using SSL (but Thunderbird does!). Of course I do not want to use the calendar without SSL. It's just a guess, but does iOS calendar does not support Let's encrypt certificates anymore?? However Safari can connect to the calendar just fine, without certificate warning or similar. It does not make sense to me that one iOS app should accept the LE certificate and the other should not. Calendar account setup does also not show me the certificate to allow me to accept it, nor a meaningful information why it refuses to connect... Thanks in advance! Frank
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Can't sync CalDav/CardDav

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