This is applicable only if SQL Server is configured in an IPv6 network environment.
The SQL Analysis Services server properties, IPv4 Support and IPv6 Support, determine which protocol is used by the Analysis Server. You must manually modify these properties to enable IPv6 support for Analysis Service.
These steps are required only if you have configured named SQL Server instances. Perform the following steps for each named SQL Server instance. Repeat these steps on all the cluster nodes that will host the SQL service group.
To enable IPv6 support for SQL Server Analysis Service
This means that IPv4 is disabled. Analysis Server does not listen on the IPv4 port, and clients will not be able to connect using IPv4.
This means that IPv6 is optional. The Analysis Server tries to listen on the IPv6 port, but will silently ignore errors and continue to start if IPv6 is not available.