3472336 - Event Sender cannot connect with Integration framework with the error 401

When trying to set up the Event Sender Service to connect with SAP Business One Integration Framewok, by using the Event Sender set up tool (step 3/5), there is an error: 'Connection to integration framework server failed HTTP/1.1 401'

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Event Sender Service

SAP Business One Integration Framework

Business One Integration Framework Event Sender 401 http user connection failed service , KBA , SBO-INT-B1IF , SAP Business One integration framework , Problem