I dont think this is possible and even if it is, it's a bad idea as it gives a potential hacker a better idea of how they are getting on.
What I mean by that is, currently have 2 unknown values,
"Who I am" the username and "What I know" the password. By dropping the connection after a failed attempt I now know that is an invalid option, once I get prompted for a password, I now know the "Who I am" part of your security policy where as before I had nothing.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...