Can't connect to collabora server

Hello,

Im running nextcloud in an unraid docker container. Now I have everything up and running, only I wanted to be able to edit my files online. I found Collabora and started setting up a server for it.

Now when I try to connect to it in Nextcloud it is setting up a new server for about 1 minute and then it just fails. But when I do the wrong IP it fails instant. Does anyone know what this problem might be? When it fails it gives the same message as when I put the wrong IP in. “Could not establish connection to the Collabora Online server.” If anyone knows what I need to change, that would be great.

Thanks!

checked /etc/hosts ?

using your own collabora server or the build in version ?