It is sometimes useful to pause the flow of messages through interop... this might be so that you can examine the messages' payload, or it might be so that you can simulate a delay in delivery.
Whatever the reason, here's a less intrusive way to accomplish the pause.
Open a browser window
Internet explorer should be your last choice for this, by the way.
If you are running remote desktop to the interop server, the URL can be
http://Localhost/interoperability
You could also access from another computer, e.g.
https://qa-bcsf.bentley.com/Interoperability/becs-testing
Navigate to Engines
Navigate to the Engines page:
Look at the Connections section (scroll if you need to) and find the connection at issue here.
For example, here is the connection for AcknowledgeRequestsForWork inbound to APM.
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Stop the connections for SyncWorkRequests, SyncSolutionPackages, etc.
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Click stop once on each: it doesn't respond quickly even though it is really working
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After a moment, refresh the listing to confirm that each is stopped
Incoming messages will pile up in the queues now.
Once finished, start the connection(s) again..