I am getting below error when I am executing setmqaut on IBM-MQ queue manager
bash-4.4$ setmqaut -m QM1 -t qmgr -p mqadmin +connect
AMQ7026E: A principal or group name was invalid.
The error basically returns that MQ was not able to find user 'mqadmin'. Please check the queue manager CONNAUTH value for the configured authentication method. If the default 'SYSTEM.DEFAULT.AUTHINFO.IDPWOS' is used then check within the machine to see if the user 'mqadmin' is available. If you are using LDAP for authentication then check if that 'mqadmin' is available on ldap server and MQ is able to contact ldap server.