Open console and set xkb map to correct model & layout.
setxkbmap -model pc105 -layout no
Replace model and layout language code to whatever is the correct one for you. I just ran setxkbmap -print on the PC to get an idea about these values. You can either run the console through a RDP session or perhaps even login through ssh with X display redirection, like this ssh -X <server>.
Generate XRDP keymap file:
xrdp-genkeymap km-0414.ini
sudo mv km-0414.ini /etc/xrdp
sudo chown root:root /etc/xrdp/km-0414.ini
Replace the country code 0414 with the correct code for your country.
Restart the xrdp service
sudo service xrdp restart
try country code 0409 (en-us)
List of other countries :
https://sourceforge.net/p/rdesktop/code/1704/tree/rdesktop/trunk/doc/keymap-names.txt