Ensure that all administered IP addresses, patterns, and address family settings are IPv4. When you disable the IPv6 property, you cannot use IPv6 based addresses, patterns, and ranges. When you attempt reverting to IPv4, the system displays errors for areas of administration that are not compatible.
Procedure
On the home page of System Manager web console, in Elements, click Session Manager > Session Manager Administration.
On the Global Settings tab, clear the Enable IPv6 check box.
