PRTG's sensors Windows MSMQ Queue Length and Windows Print Queue need the queue name to be entered on the sensors settings page. How can I determine the right queue name?
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PTF.ListQueues
PTF.ListQueues is a tool that queries a computer for MSMQ's and Print Queues and lists the result.

The tool can be downloaded from this page.
Mar, 2011 - Permalink
the queue name is the name of the printer given on the print server
Mar, 2011 - Permalink