I have a nextcloud setup like described here (docker-compose, let’s encrypt proxy companion, postgres and nextcloud). And for a while I couldn’t connect any new nextcloud clients to the installation.
This fixed it:
<?php $CONFIG = array ( # manually added because it's not picked up from # the env vars once set ... it seems ... # the docker IP range 'trusted_proxies' => ["172.16.0.0/12"], # the hostname of the server 'overwritehost' => "my.super.secret.server", # the ENDUSER->PROXY protocol, NOT the proxy-> nextcloud protocol! 'overwriteprotocol' => "https", # # AAAND NOW back to the original config file ... # ... )