Microsoft Remote Desktop - stuck at "Negotiating Credentials"

[ags]

I have a BBB A6A (2GB eMMC) running 3.8 kernel:

uname -a

Linux BBB-A6A-1 3.8.13-bone50 #1 SMP Tue May 13 13:24:52 UTC 2014 armv7l GNU/Linux

I now also have a BBB 0C0 (4GB eMMC) and BBBWireless, both running the 4.4. kernel:

uname -a

Linux BBB-WA5-1 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l GNU/Linux

Setup of the original BBB to support remote desktop (using xrdp) was smooth. I've tried to setup the same access (Microsoft Remote Desktop <-> BBB xrdp) with no luck.

Is there a different setup required on the BBB with the new kernel, and if so, what is it? It appears to be an access/authentication issue. When attempting to connect, I get a "Negotiating Credentials" message, which either hangs forever, or immediately terminates the connection attempt. I can ssh successfully into both of these new 'Bones.

Thanks.

[ags]

So I'm thinking that the problem is due to the upgrade to the newer Debian release. Any pointers to information that may be available pointing out potential differences in the releases in xrdp and how it authenticates?