Unable to connect to rabbitmq broker that runs with self-signed certificates

[henkesde92]

Describe the bug
I'm unable to run flower when rabbitmq is running with TLS with self-signed certificates. However, when I disable TLS on both components, everything is running correctly.

When using rabbitmq with TLS, I run it on port 5671/15671, without it's running on 15672/5672.

Here are both commands how I want to run flower respectively:

TLS:
/usr/local/bin/celery --app celery_flower --broker=amqp://<username>:<password>@<servername>:5671//?ssl=1 flower --broker_api=https://<username>:<password>@<servername>:15671/api/ --persistent --db="/root/flower/data/flower.db"

non-TLS:
/usr/local/bin/celery --app celery_flower --broker="pyamqp://<username>:<password>@<servername>:5672//" flower --broker_api="http://<username>:<password>@<servername>:15672/api/" --persistent --db="/root/flower/data/flower.db"

The "non-TLS" example also works when I use "amqp" instead of "pyamqp". I already tried a lot of different approaches to get it working, but somehow I think that the issue is correlated to the self-signed certificates on the rabbitmq side.

I can also find the following logs on the rabbitmq-server:

2024-01-16 10:56:18.043985+01:00 [notice] <0.1962.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.043985+01:00 [notice] <0.1962.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.239173+01:00 [notice] <0.1968.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.239173+01:00 [notice] <0.1968.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.387667+01:00 [notice] <0.1974.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.387667+01:00 [notice] <0.1974.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.414899+01:00 [notice] <0.1986.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.414899+01:00 [notice] <0.1986.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.415532+01:00 [notice] <0.1980.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.415532+01:00 [notice] <0.1980.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.591205+01:00 [notice] <0.1993.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.591205+01:00 [notice] <0.1993.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.591379+01:00 [notice] <0.2002.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.591379+01:00 [notice] <0.2002.0> - {record_type_mismatch,21}
2024-01-16 10:56:18.591668+01:00 [notice] <0.2001.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:18.591668+01:00 [notice] <0.2001.0> - {record_type_mismatch,21}
2024-01-16 10:56:22.913618+01:00 [notice] <0.2015.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:22.913618+01:00 [notice] <0.2015.0> - {record_type_mismatch,21}
2024-01-16 10:56:27.918545+01:00 [notice] <0.2021.0> TLS server: In state wait_finished at tls_record_1_3.erl:213 generated SERVER ALERT: Fatal - Bad Record MAC
2024-01-16 10:56:27.918545+01:00 [notice] <0.2021.0> - {record_type_mismatch,21}

These logs don't show up anymore as soon as I stop the flower server. Consumer and producers are working as expected with rabbitmq running with TLS.

Can somebody help me to figure out my issue?