Let's say the following error is returned in the IBM MQ error log.

AMQ9513E: Maximum number of channels reached.

Check to see if MaxChannels is defined in the mqs.ini file, which is typically located at /var/mqm/mqs.ini. If so, you can increase the MaxChannels value, and then restart the queue manager for this change to take effect.

MaxChannels: 1000

The display chstatus command with the wc (word count) command can be used to display the current number of channel connections.

echo "display chstatus (*)" | runmqsc MANAGER01 | grep 'AMQ8417' | wc -l