i've Debian jessie and NC 11.0.3 installed. On a new server i've install a jessie and the docker with collabora. But if i open a document on nc is a "Access denied" error. Letsencrypt Cert is on the collabora machine installed. I#ve do this steps: https://nextcloud.com/collaboraonline/
If i browse to https://office.mydomain.tld/hosting/discovery this error is show:
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /hosting/discovery.
Reason: Error reading from remote server