This article explains why you cannot log in to the SecureCloud Management Server for Managed Service Providers and SaaS when you are using the IP address and Windows Active Directory authentication.
The issue occurs when you are using the IP address and Windows Active Directory authentication to connect to the database during installation.
As a workaround, disable the loopback check. Follow this Microsoft article: You receive error 401.1 when you browse a Web site that uses Integrated Authentication and is hosted on IIS 5.1 or a later version.