CAPM 3.6.x and later
Checked the DA as the karaf.log was very small.
Check the processes using:
ps -ef | grep -i activemq.jar
If there are 2 activemq processes running, then shut down the dadaemon, activemq and if necessary, kill the still running activemq process. Then restart activemq and the dadaemon as per normal. Then restart the DC's.