How to allow blank passwords for Vista Remote Desktop

Two methods:

1. Using regedit:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Lsa
“LimitBlankPasswordUse”=dword:00000000

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
“LimitBlankPasswordUse”=dword:00000000

2. Using Local Security Policy:

Control Panel -> Administrative Tools -> Local Security Policy (run as system administrator)
Local Security Policy -> Local Policies -> Security Options
Set “Accounts: Limit local account use of blank passwords to console logon only” to Disable

Useful links: