According to Symantec, there is no solution yet to this method which is related to IPv6.
However my server is configure with IPv4, I was confuse what is that IPv6 issue.
Firstly type ipconfig in command prompt to check what is the IPv6 address and which network adapter is it attach to.
I found the IPv6 is attach with tunnel pseudo interface
In backup exec server, you can also verify the IPv6 address details in “Backup and restore” tab’s server details
After verify all the things, disable the network adapter of tunnel pseudo interface and try to configure the backup policy.
Things should be working fine