In order to create a forwarding rule, a forwarding host needs to be created and under this forwarding host, there is an Alias name that needs to be entered.
There is a limit on how many characters that can be entered in the Alias name field.
The limit is 64 characters.
Release : 6.7.x and 7.x.
Component : Forwarding.
Under the Configuration > Forwarding > Forwarding Host, there is an option to enter the Alias name and the limit for this Alias is 64 characters.
If the character is more than 64, then an error will appear when trying to apply the settings - "% Alias name is too long".