To modify a broker on Windows:.
mqsichangebroker brokername <<-i ServiceUserID> -a ServicePassword> <-p DatabaseSourcePassword> <-s UserNameServerQueueManagerName> <-j | -d> <-t | -n> <-l UserLilPath> <-g ConfigurationTimeout> <-k ComfigurationDelayTimeout> <-v StatisticsMajorInterval> <-P HttpPort>
mqsichangebroker WBRK_BROKER -i wbrkuid -a wbrkpw
If you cannot change a property using mqsichangebroker, delete the broker and then create a new one with the new properties.