So I just had a laptop with 41 on pre-6.3 Plasma, and I could RDP into it fine. I updated and could no longer RDP in. I didn't see a process in htop for /usr/bin/krdpserver when I turned it on-off-on-off-on in Settings-Remote Desktop. So I move the video quality slider and it says it needs to restart the server, so I do that, and now I see it in htop and can rdp in.
I try it the other direction, no go. Try the same trick and while it has a server running now in htop, I just get a black screen on connection from the first computer. So I down the one in Settings, and just run /usr/bin/krdpserver from a terminal. That helps me figure out that it's upset about my multimonitor setup now. So I run krdpserver -u ikidd -p 1111 --monitor 3 --quality 100
and then it connects, though only to the single monitor I specify, of course.
I'm also using the commandline xfreerdp directly instead of the KRDC wrapper. I don't have a lot of trust in that wrapper. My typical commandline is something like xfreerdp /v:192.168.8.131 /u:ikidd /p:"1111" /dynamic-resolution +clipboard /cert:ignore /console /size:1920x1080
Hopefully that gives you something to work with. You can also check https://bugs.kde.org/buglist.cgi?component=general&product=KRdp&resolution=---
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