Hi,
I have a peculiar "feature" where I have installed SQL Server 2019 as a named instance with a static port (for this test I used 14430) onto a Server 2019 Windows cluster (not always on cluster) and SQL Management Studio on a separate server.
I have opened the firewall ports TCP 1433 + instance port (14430) and UDP 1434 on the inbound firewall on the SQL server but I am finding I have to open UDP outbound to the server on the server that has SQL Management Studio installed.
Any idea why I have to have an outbound UDP firewall rule to be able to connect to the remote SQL server? I have tried from 2 different servers with both the same result.
It appears I can connect ok to a SQL Server 2017 without having to enable outbound UDP.