I having been using xrdp on Mate 16.04 and 18.04 installed on my 3B+ for weeks. I have been accessing the Pi using a RDP connection on Remmina on my Linux Mint laptop and with remote desktop on my win 10 laptop without issue. I just restored my 16.04 image to the Pi and for no good reason, xrdp no longer connects. Instead I get the error message below. The Pi’s ip address and all other settings have not changed. Any ideas would be appreciated.