Unable to connect to SQL Server AlwaysOn Listener on Azure due to misconfigured subnet mask

When it comes to troubleshooting, the more you know the better troubleshooter you are (in my option). Sometimes knowing more actually gets in the way.   We repeatedly get calls where customers couldn’t connect to AlwaysOn Listener on Azure because of the misconfiguration of the subnet mask for the listener IP. They receive this error “A…

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