Hi,
I'me stil struggling with this issue.
Can anyone suggest a way to debug this?
When I use sso with ssh, PUTTY takes the user name and some form of user credentials from my Windows station and pass it to the ssh daemon on the Linux server.
When I use RDP the process that first responds is xrdp. It promts for user name and password and then call xrdp-sesman to authenticate the user. I suspect that xrdp pass the user name and the (missing) password from the prompt and not the Windows credentials.