I am on latest version of Nextcloud 11 Snap on an Ubuntu 16.04 server.
I have an SSL certificate from Let’s Encrypt. I used No-ip.com to set up a free hostname.
So I have https://xxx.hopto.org
My Androids can connect with no problems, my ipad and iphone get the error message
"Unable to connect to the server at this time"
Apparently iOS10 does not like my SSL certificate.
Is there a workaround other than switching back to http?