`json.decoder.JSONDecodeError` when executing `list queues` with `rabbitmqadmin`

I want to list available queues on a remote RabbitMQ server with the following command: rabbitmqadmin --host=a.b.c.com --port=443 --username=user --password=pwd list queues But it ends with an error: Traceback (most recent call last): File "/usr/bin/rabbitmqadmin", line 1150, in main() File "/usr/bin/rabbitmqadmin", line 494, in main method() File "/usr/bin/rabbitmqadmin", line 694, in invoke_list format_list(self.get(uri), cols, obj_info, self.options) File "/usr/bin/rabbitmqadmin", line 523, in get return self.http("GET", "%s/api%s" % (self.options.path_prefix, path), "") File "/usr/bin/rabbitmqadmin", line 597, in http die(json.loads(resp.read())['reason']) File "/usr/lib/python3.8/json/__init__.py", line 357, in loads return _default_decoder.decode(s) File "/usr/lib/python3.8/json/decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "/usr/lib/python3.8/json/decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) I have tried lots of variants of the command: without credentials, with -k option... but without success. The error has always been the same. nmap tells me that the host a.b.c.com is alive and the port 443 is open. The error may indicate a problem with python, but how the workaround may look like? Installing another version of rabbitmqadmin (the current one is 3.8.2) or another python version (the current one is 3.8.10)? I've also downloaded rabbitmqadmin from the remote server as explained here https://www.rabbitmq.com/management-cli.html and used it. The downloaded version was 3.8.19 but it didn't help. Not sure what is going on behind the scenes that causes this error...