And the web UI at http://192.168.1.40 does work well, I am able to login and configure everything. Also, the swagger UI at http://192.168.1.40/swagger loads well.

Apologies, I used this command: curl -X GET \ --user configuratie:PASSWORDHERE \ http://192.168.1.40/fhapi/v1/api/rest/configuration

The documentation suggest to connect over HTTPS but the SSL/TLS port is not open for connections, only the HTTP port. When I try this command, 500 Internal Server Error is also reported: curl -X...

Swagger encodes the string <username>:<password> with Base64 and passes that as the Authorization: Basic token. Is that incorrect or not supported? Does this username need to have installer...

Yes I do have version 2.6.3 installed.

I still get internal server error 500 for any call in Swagger after I authenticate with a user with configuration permissions. Example request: curl -X GET "http://192.168.2.1/fhapi/v1/api/rest/configuration"...