MQ Connection

we wrote a code in webmethods that monitors 15 queues those are existed in MQBox. In our code we loopover the queues, establish connection queue and gets the depth of the queue. After that it closes the Queue and disconnects the Queue Manager. we repeat samethging for 15 times. After that i looked at CHANNEL in the MQ Box. There is one connection is not closed. Can anybody have any idea, why it is happening like that…