Probe Exception: ‘System.Net.Sockets.SocketException (0x80004005): No connection could be made because the target machine actively refused it 127.0.0.1:587 on Exchange Servers

You get following events in the Managed Availability Logs on Exchange 2013/2016. Log Name: Microsoft-Exchange-ManagedAvailability/Monitoring Source: Microsoft-Exchange-ManagedAvailability Date:  Event ID: 4 Task Category: Monitoring Level: Error Keywords: User: SYSTEM Computer:  Description: The client submission probe failed 3 times over 15 minutes. No connection could be made because the target machine actively refused it 127.0.0.1:587 Probe…

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