On Solaris systems, when you try to configure an IPv6 server on a installation, the message unable to add server appears. This can be caused by the way the Solaris operating system handles the ping request for an IPv6 address.
On Solaris systems, when adding a server to the configuration, Load Balancer tries to ping the server to obtain the MAC address of the server. The Solaris machine might choose a configured cluster address as the source address of the ping request, instead of using the NFA address of the machine. If the cluster address is configured on the server loopback, the ping response is not received at the Load Balancer machine; therefore, it does not add the server to the configuration.
The solution is to configure another IPv6 address on the Load Balancer machine either before or after configuring the IPv6 cluster address. This address must be an address that is not aliased on the loopback of the back-end server on which you are trying to add to the Load Balancer configuration. Then add the server to the Load Balancer configuration.