Availability groups firewall port requirements

There’s a really good guide on installing and setting up AG by Brent Ozar, but if you want to setup a multi subnet failover cluster, you will need a lot of ports opened up so that your AG will actually work.

Port number Between Reason
5022 TCP Nodes AlwaysOn port for primary and secondary replicas
1433 TCP Nodes SQL Server communication
3343 UDP Nodes Cluster node communication
137 UDP Nodes DNS communication
135 TCP/UDP Nodes and Cluster IP DNS communication
49152 through 65535 TCP/UDP Nodes Dynamic ports communication
445 Nodes SMB communication
139 Nodes NetBIOS communication
464 Nodes and domain controllers Active Directory communication
1433 Network and VPN for DBAs to nodes and listener IP

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