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KB9682 - Cluster members cannot communicate, what ports need to be opened?

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Last Modified Date8/14/2015 2:12 PM
Synopsis
This article describes which ports must be opened (allowed through the firewall) in order for cluster members to communicate between nodes.
Problem or Goal
Cause
Solution

When a cluster is created, all the nodes must be able to communicate with one another.  If a firewall exists between any of the nodes, there are a few ports that need to be opened so that each PCS can communicate with each other.  Here is a list of the protocols, port numbers, when the port is used, and what the port is used for:

Protocol
Port
When Purpose
TCP/IP
4808
Clustering on, AlwaysP2P encrypted communication
4809

Clustering on, Always

P2P clear text communication
4900-4910
For a short period during handshakeKey exchange for group communication, state sync where applicable
UDP
4803
Clustering on, AlwaysGroup communication
4804
Clustering on, AlwaysToken Heartbeat


Verify on all firewalls that exist between the nodes of the cluster that the above ports are open for communication between the cluster nodes.

The communication can be verified by using the cluster troubleshooting tool.  For more information on the cluster troubleshooting tool see: KB9746 - How to use the Cluster Troubleshooter tool

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Created ByData Deployment

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