said by darkwood:
Thanks Brano for your reply,
The log is very simple, say: User domain\myuser has been denied from L2TP service.(Incorrect Username or Password)
When i validate with this user to access by ssl is ok, when test in ad configuration with this user is ok.
In ad box no log.
i've already got this error of the "Incorrect Username or Password"
if your AD is in a domain,you should try to log in L2TP without adding the domain name, just User and Password