Thanks RayMitchell,
In fact I already read the faq's documentation, 
Let me explain more clearly my situation.
I have just installed SME Server for the first time. 
The installation walked well. 
The problem arrives when I need to reset the password for a new account
Creating a password for a new account does not work, 
of course I followed all criteria to reset  or change a password (upper case letter, lower case
letter, number, non-alphanumeric character, be at least 7 characters long),
you Also can Consider that I did not change password strength sttings after instalation.
if you can help me I will appreciate.