When you work with failover cluster instances (FCI) for SQL Server on an Azure virtual machine (VM) that doesn't support floating IP addresses, FCI becomes inaccessible in Microsoft SQL Server 2017.
This issue is fixed in the following cumulative update for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for your version of SQL Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.