AMQPLAIN login refused when launching Openstack instance

[Ravindu Madawalagama]

Hi RabbitMQ users,

I'm setting up Openstack on my pcs and as per the install guide I used RabbitMQ as the message queue. 

When launching an openstack instance, it gets stuck at BUILD status and I identified this as a problem caused by AMQP connection refused error. 

The credentials for Rabbitmq user is given to openstack compute service Nova via the nova.conf file. I've triple checked this and the credentials are correct.

While  all other nova services establishes connection via AMQP, nova-conductor fails. This is the log file message.

ERROR oslo_messaging.rpc.server amqp.exceptions.AccessRefused: (0, 0): (403) ACCESS_REFUSED - Login was refused using authentication mechanism AMQPLAIN. For details see the broker logfile

This is the message on the rab...@controller.log. 

AMQPLAIN login refused: user 'openstack' - invalid credentials

But on the same log file I can notice that other nova services establishes connection for the same user credentials and this is really confusing.

RabbitMQ version: 3.9.13

Nova version: 26.1.0

OS: Linux Mint 21

Can you offer some insight on what might cause this?

Thank You.

Ravindu