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Issues with SQL Server 2019 Cluster

Bojan Zivkovic 506 Reputation points
2025-01-09T10:49:53.36+00:00

Hi, recently I have deployed Firewall GPOs to all servers in all my environments without any issues but one affecting SQL Server 2019 Cluster in one environment (Firewall GPOs applied to cluster nodes are the same in all environments but I have issues only in one).

When I unlink Firewall GPOs from OU containing cluster nodes, SQL Server 2019 Cluster works fine. Having linked Firewall GPOs, after 10-ish minutes cluster breaks with Event ID 1135 suggesting inter-node communication issues but I do not see anything in Wireshark suggesting some ports not being included in Firewall GPOs.

Any help would be appreciated.

Windows Server Clustering
Windows Server Clustering
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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