Adapter for Salesforce listener notifications subscribed to the same push topic receive duplicate messages when the notifications are enabled on all nodes in an Integration Server cluster. Salesforce.com sends notifications to all the clients subscribed to a push topic. Each listener notification in a cluster makes an independent connection to the push topic and all listener notifications get notified of the same event. Thus the listener notifications in an Integration Server cluster will be triggered multiple times (as many times as the number of Integration Servers in the cluster) for the same event on the push topic.

To avoid creating duplicate messages, Software AG recommends that you keep a particular listener and its associated listener notification(s) enabled only on one of the Integration Server nodes in a cluster for each push topic.