These network ports are described in this topic.

If you have firewalls or network devices that could potentially restrict or alter this kind of internal network traffic, you need to configure rules that allow free and unrestricted communication between these servers: rules that allow incoming and outgoing network traffic on any port (including random RPC ports) and any protocol that never alter bits on the wire.Įdge Transport servers are almost always located in a perimeter network, so it's expected that you'll restrict network traffic between the Edge Transport server and the internet, and between the Edge Transport server and your internal Exchange organization. We do not support restricting or altering network traffic between internal Exchange servers, between internal Exchange servers and internal Lync or Skype for Business servers, or between internal Exchange servers and internal Active Directory domain controllers in any and all types of topologies. Before we get into that, understand the following ground rules: This topic provides information about the network ports that are used by Exchange Server 2016 and Exchange Server 2019 for communication with email clients, internet mail servers, and other services that are external to your local Exchange organization.

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