Specifying the password encryption key
From IBM® MQ 9.1.5, if the MQIPT configuration contains passwords that are encrypted using an encryption key other than the default key, you must provide the password encryption key in a file that MQIPT can read when it starts.
From IBM® MQ 9.1.5, if the MQIPT configuration contains passwords that are encrypted using an encryption key other than the default key, you must provide the password encryption key in a file that MQIPT can read when it starts.