When you apply username/password LOCAL authentication on PIX i think it will override all the other passwords set to different connection methods like you have configured. And it will then require some username/password pair that you have configured in the PIXs LOCAL database.
Not sure if this is even relevant to your problem but thought id post this here. Was doing my final work and wondered why some passwords didnt work at one point.
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...