Under Windows XP, the ForceGuest registry value is set to 1 by default in the following registry key:
On a Windows XP computer you must check:
If the Guest account is enabled, an SSPI logon will succeed as Guest for any user credentials.
If ForceGuest is disabled (set to 0), SSPI will log on as the specified user.
If the authtest util gives guest account blocked, an open guest account is detected and ms logon denies all access.
UltraVNC 188.8.131.52.1 (built 20110518)
OS Win: xp home + vista business + 7 home
only experienced user, not developer