I've seen this problem reported a few times for example this Ask Ubuntu question: Xrdp login failed but none of the questions had answers which worked for me - so I am raising a new post to try and get help with this. I think the difference between the other questions and mine is that I am on a company network and I am using a company-wide login. So the logon (userid/password) for my Windows desktop is the same as for my Ubuntu desktop.
I am trying to connect to my Ubuntu v16.04 Desktop from a Windows7 desktop using Windows Remote Desktop (RDP) but I get the error,
I am able to connect to the Ubuntu desktop from my Windows machine using Putty/openssh and also via a VNCViewer...but I would like to be able to use Windows RDP.
I have installed the xrdp software on Ubuntu but as shown in the screenshot there is an issue authenticating myself via the "SesmanXvnc" login screen.
I assume that my login credentials are picked up from our company network but I don't know how this works exactly in Ubuntu. I use the same credentials with Ubuntu as I use to log into Windows.