Dear jarus,
I am sorry for the delayed response.
Error 2245 (NERR_PasswordTooShort) can have different meanings. I can mean the password is to short, to long or does not meet the password policies.
One typical issue on Windows 2003 R2 is explained in this article:
http://www.passwordmanager.com/en/FAQ/min-password-age-policy.php
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Hopefully this will help.
best regards,
Andre Lorbach