Orchestrator errorcode 0 after installation

I have always been using the FQDN link and never changed the URL.
I just added added the port onto the UiPath.orchestrator.dll.config file and the error disappeared.
The orchestrator is still not working, I still have the following issue :

System.InvalidOperationException: IDX20803: Unable to obtain configuration from: ‘System.String’.
—> System.IO.IOException: IDX20804: Unable to retrieve document from: ‘System.String’.
—> System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception.
—> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host…
—> System.Net.Sockets.SocketException (10054): An existing connection was forcibly closed by the remote host.
— End of inner exception stack trace —

Any idea ? Is it linked to the previous error ?