Exchange Ports

Occasional Visitor

Hell community, I have a question regarding a open port on my 2016 exchange servers. I have four on-prem exchange servers that are open on port 6400. This port does not have a service name and all I can find on this port is it may pertain to a recent patch. Can someone confirm that or provide more detail to what this port is and the business case for this port to be open. 

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