Windows 7 Remote Desktop not connecting

Obviously you want to rebuild the network when the problem is in a single computer.

This thread is intriguing. By your advanced powers of observation you know accurately what I think. On the other hand, by my own lack of observational powers I still struggle to understand your setup. Here are some of the things one considers when dealing with a Remote Desktop configuration:

• Are the host and the problem machine on the same network, i.e. do they share the same subnet?
• Are they on a VPN?
• Are they on different networks, connecting through one or several routers?
• What port do you use for the RDP connection?
• Do the routers have a tunnel for this port?
• Do you access the host by IP address or by NetBIOS name?
• Do you use an .rdp profile file?
• Does the problem persist while all firewalls are turned off?

Each of these items is important when setting up a RDP connection.

• The system you're trying to connect to (=the Host) must run Windows 7 Professional.
• You must be able to ping it.
• The command you see below must get a response:

telnet  NameOfHost  3389

I would perform a number of tests until I could find the culprit. Assuming that PC-R (=Remote) is your own machine and PC-Host is the RDP host machine (the one you want to jump onto), my first test would go like this:

1. Obtain a Windows 7 or 10 Professional test PC. I shall call it PC-TestHost.
2. Connect it to the same network as PC-R.
3. Disable its firewall.
4. Give it a fixed IP address, e.g. 192.168.11.55.
5. Enable Remote Desktop on it.
6. Run this command on PC-TestHost: telnet %ComputerName% 3389. It must respond.
7. Run this command on PC-R: telnet  192.168.11.55 3398. You should get a response.
8. Run this command on PC-R: mstsc /v 192.168.11.55. You should get a log-in prompt.
9. If you don't, run the same command on any other PC on the same network.

This test will reveal if you have a problem with PC-R.

I would also like you to report the data in this registry location of PC-Host:

HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp/Port Number

The problem isn't with the host or the network.  The problem is with this computer.  Other computers running windows 7 connect without a problem.  Other computers running windows 10 connect without a problem.

Ping works fine  tracert works fine  telnet gives the message  'telnet' is not recognized as an internal or external command, operable program or batch file.