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Windows Firewall on SQL Server Always On High Availability

Guest /u/Disastrous-Pie1897

By Guest /u/Disastrous-Pie1897
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Guest /u/Disastrous-Pie1897

Guest /u/Disastrous-Pie1897

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We are attempting to enable Windows Firewall on a SQL Server database server (secondary) that is part of a high availability cluster. Our general setup is to block all inbound connections and create rules for needed traffic. The issue we're running into is that after we enable the firewall (via GPO) the databases show up as "Not Synchronizing" in SSMS. I've allowed port UDP 3343 and TCP 3343 and 5022 from the primary node in the cluster. When I review logs, I notice there is blocks from 169.254.x.x IP (belongs to the primary node as the Microsoft Failover Cluster Virtual Adapter) to a multicast address (224.0.0.251/252) on my secondary node over UDP 5353 and 5355. I haven't found this being needed in any documentation, anyone have experience adding this to their servers?

 

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