5a693e87_Plus__known_issues____RealVNC___Workaround
[ID] 46 [Description] An image cannot be mounted when connected using non-Kerberos authentication credentials in a Kerberos network environment. [Status] Under consideration. [Workaround] 
Connect to AMT Server using an IP address instead of a host name.
VNC® Viewer Plus (known issues) - RealVNC®
Workaround