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You are unable to join a node into a cluster if UDP port 3343 is blocked

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This article provides a solution to an issue where users are unable to join a node into a cluster if UDP port 3343 is blocked.

Applies to:   Windows Server 2012 R2
Original KB number:   2455128

Symptoms

Consider the following scenario:

  • On a computer that is running Windows Server 2008 or Windows Server 2008 R2.
  • You attempt to join the node into a cluster.

In this scenario, you may not be able to join the node into the cluster and you may receive the following error in system event log:

Log Name: System
Source: Microsoft-Windows-FailoverClustering
Date: <date>
Event ID: 1572
Task Category: Cluster Virtual Adapter
Level: Critical
Keywords:
User: SYSTEM
Computer: <computer>
Description:
Node <computer> failed to join the cluster because it could not send and receive failure detection network messages with other cluster nodes. Please run the Validate a Configuration wizard to ensure network settings. Also verify the Windows Firewall 'Failover Clusters' rules.

Cause

Cluster nodes communicate over User Datagram Protocol (UDP) port 3343. The issue may occur because the UDP port 3343 is not opened.

Resolution

To fix the issue, open the required UDP port 3343 on the cluster.

More information

This is a sample cluster log. The UDP port 3343 on the cluster is blocked:

00001344.0000043c::2010/07/27-12:54:42.832 INFO [CORE] Node 88f462ac-eb7c-4b57-aaf2-7a989aa38806: Cookie Cache 88f462ac-eb7c-4b57-aaf2-7a989aa38806
00001344.0000043c::2010/07/27-12:54:42.832 DBG [CHANNEL 10.100.20.27:~3343~] Not closing handle because it is invalid.
00001344.0000043c::2010/07/27-12:54:42.832 WARN cxl::ConnectWorker::operator (): GracefulClose(1226)' because of 'channel to remote endpoint 10.100.20.27:~3343~ is closed'
00001344.00001b8c::2010/07/27-12:54:43.815 INFO [JPM] Node 3: Selected partition 904(1 2 4 5) as a target for join
00001344.00001b8c::2010/07/27-12:54:43.815 WARN [JPM] Node 3: No connection to node(s) (2). Cannot join yet
00001344.0000043c::2010/07/27-12:54:44.813 INFO [JPM] Node 3: Selected partition 904(1 2 4 5) as a target for join
00001344.0000043c::2010/07/27-12:54:44.813 WARN [JPM] Node 3: No connection to node(s) (2). Cannot join yet
00001344.00001b8c::2010/07/27-12:54:45.827 INFO [JPM] Node 3: Selected partition 904(1 2 4 5) as a target for join
00001344.00001b8c::2010/07/27-12:54:45.827 WARN [JPM] Node 3: No connection to node(s) (2). Cannot join yet
00001344.0000043c::2010/07/27-12:54:46.825 INFO [JPM] Node 3: Selected partition 904(1 2 4 5) as a target for join
00001344.0000043c::2010/07/27-12:54:46.825 WARN [JPM] Node 3: No connection to node(s) (2). Cannot join yet

You can confirm the UDP port 3343 by command netstat -ano.

For more information, see Event ID 1572 — Network Connectivity and Configuration.