Hi Derick! VisualSVN Server doesn't support LDAP authentication, but it supports Windows Active Directory authentication.
To use Windows authentication you could chose "Use Windows Authentication" option during the installation process of the VisualSVN Server. You could also set this in the VisualSVN Server Manager: VisualSVN Server|Properties|Use Windows Authentication. -- Regards, Olga Dolidze VisualSVN Support

