Members of the AuthAnvil Override group can not log in via Remote Desktop/Terminal Services using saved credentials on Windows Server 2003 and earlier.
Due to the structure of the MSGINA (the logon provider for Windows Server 2003 and earlier), group membership cannot be evaluated before the session is connected. Saved credentials for AuthAnvil Override group members cannot be used without breaking the security model for the system.
No workarounds are available for Windows Server 2003 and earlier.However, this behavour is supported in Windows Vista and later, because the Credential Provider model for handling logins (Vista/2008/7), changes that structure, allowing the use of saved credentials.
AuthAnvil WinLogon Agent on Windows Server 2003 and earlier.