I currently have a problem with the connection of Nextcloud (version 24) and collabora. The Nextcloud and the Collabora (version 18.104.22.168) runs without problems. When I try to establish a connection from the nextcloud Server to the Collabora Server, I get the error message "Could not establish connection to the Collabora Online server. The Collabora Server ist installed as a Linux Package on an Alma Linux 8. I have also already tried to set up the Collabora Code Server via Docker or Podman. However, this resulted in the same effect.
I have already used the search function in the forum, but the help there unfortunately couldn’t solve the problem. Attached is the config of the reverse proxy for the Collabora server
I hope you can help me with this problem.