Can not see port 3389

I’m running a computer with 2 exchangeable hard drives A and B, They have
essentially the same programs. The only difference is that I test new things
first on A alone.

Remote desktop (Rd) works on B, but recently stopped working on A. I’m not
sure, why it stopped precisely. I had experimented among others with Skype
and Windows OneCare, but removed them when I noticed that Rd had stopped
working on A.

I followed
http://theillustratednetwork.mvps.or...eshooting.html.

On A and B
Desktop is enabled, the user is defined, the firewall is modified , no-ip
installed, the IP address and TCP is listening on port 3389. Everything
exactly the same on both A and B.

But on A
www.canyouseeme.org can not see port 3389 and
Portqry gives TCP port 3389 (unknown service): LISTENING
portqry.exe -n 192.168.15.100 -e 3389 -p TCP exits with return code
0x00000000.

Any suggestions what could be the problem?
Thanks in advance, Gerhard