I installed Nextcloud and Collabora on an Ubuntu 18.04 server following the instructions at: HowTo: Ubuntu + Docker + Nextcloud + Talk + Collabora
When inserting the Collabora server address (office.domain.com) in the Nextcloud settings, I get following error: “Could not establish connection to the Collabora Online server”
Additionally I expected Collabora to show up at my “office.domain.com” website but the Apache welcome-page was there instead.
Installing and enabling the built-in CODE failed as well.
Any hints on how I can solve this issue.
I double checked the config files and repeated the installation already.