Need
1) your PC's internal IP (e.g. 192.168.0.x)
2) your router's internal IP
3) your router's external IP.
4) a user account that's an administrator with a password enabled. Eg. If you log on as Bob,just set a password. USE A COMPLEX ONE.
Get 1 and 2.by typing "ipconfig /all" in a CMD prompt. Your IP is stated and your router is labelled "gateway".
For 3, logon to your router by pointing.a.browser at
http://your.gateway.ip.address. you may need to find the logon details for your router. Public IP will be.stated,probably under WAN. It won't be in the 192.168 range.
Put your PC on static IP. Set IP to what it was in 1, gateway to 2, subnet to 255.255.355.0 and DNS to 8.8.8.8 and 8.8.4.4 (google public DNS, you.can.use your ISP's but these are fast and easy to explain).
Check internet connection still working.
Assuming all is ok, you should be able to RDP on to that pc from another in your house - use static IP you set above and the user/password you set.
Assuming this works you're ready to set up remote RDP. Point your browser at your gateway address of the router and log in.
Somewhere there will be an option for port forwarding/firewall rules/services.
Basically you need to tell your router that when an external RDP request comes in from the internet, to forward it to your PC.
You need to fill it in so port 3389 coming in over the internet forwards to 3389 on the static IP you set for 1).
If correctly set up, a connection from outside your home to your poster's external IP (3) will connect to your PC. Set up a new remote desktopconnection using 3) as server name and using user/pass set up earlier. Use a STRONG PASSWORD as it WILL get probed.
I would suggest saving the connection to a desktop shortcut when set up for convenience. One for internal connection within your home using (1) and another for external using (3).
Ric
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