Ports required for Exchange 2010 Backup - VSS

Hi dears,

I need to know the ports used by Exchange 2010 / VSS backup. How Passive copy will communicate with active copy and inform it that backup successfully finished to truncate the logs?

The problem is that when backup is taken from passive copy on different site behind firewalls, logs will not truncate and VSS will show some errors events "The VSS service is shutting down due to idle timeout."

I need to know the ports so I can ask network team to increase the time out.

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