As far as I can see, the tutorial you’ve been using is missing the following lines…
# Endpoint with information about availability of various features
ProxyPass /hosting/capabilities https://127.0.0.1:9980/hosting/capabilities retry=0
ProxyPassReverse /hosting/capabilities https://127.0.0.1:9980/hosting/capabilities
About collabora is not compatible with the Nextcloud encryption, I don’t know before
It mean if we use Nextcloud encryption, we don’t use collabora, So what is app for edit document online for nextcloud?
Your Apache configs look OK as far as I can tell. Also the error message in the Nextcloud log unfortunatly supports my assumption, that the problem occurs because of the encryption.
Maybe it works with OnlyOffice or there is some workaround… But I have never dealt with this topic in detail and therefore cannot tell you whether there is an online office that works with Nextcloud encryption. Maybe you can search the forums or open a new thread specifically on this topic.
Hmm. The reverse proxy configuration for " SSL on both ends" they linked to in the Collabora forums is identical to the one I linked to, except for the order of the entries and the one line at the very beginning with the “Options -indexes” directive…