This problem requires little bit of in depth troubleshooting. However, if you can setup the logging level to Full and get the problem portion of the auth.log file for us, we should be able to point you to the right direction. In nitshell, please make sure that you have defined the proper context for the admin account. Also, if you are defining the domain name for the LDAP server on ACS, try with the ip address and see if that helps. In any case, would be interested to see the auth.log file with logging level set to FULL. Here is how to set to logging level to full:
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...