Change the RDP port for a VM instance in Google Compute
In Windows launch regedit:
Browse to subkey HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\
Right click PortNumber and click Modify
Once the Edit window shows up switch the Base to Decimal and enter the Port you want to use under “Value data:” and click OK
Restart the server
In the Google Cloud console go to the Network --> Firewall rules section
Add a new rule and give it any name following the google naming convention
The Source IP can be 0.0.0.0/0 for all or you can specify what IP’s to use as a source
Fill in the port number you want to use (please note this needs to be the same port number used in the registry change made on the server)
Create a tag for it, this can be anything you want it to say as long as it follows the google naming convention. We recommend the same as the firewall rule name to make it easy to remember
Click “Create”
Go to the Compute Engine/VM instances section of the Google Cloud Console
Select the VM instance you want to apply the firewall rule to
Once inside of the VM Instance page on the Google Cloud Console click on EDIT
Under Tags add the same tag you created for the firewall rule, in the example below obscure-rdp-port and scroll all the way to the bottom of the page and click Save
After following these steps you should now be able to RDP into a server using the new port assigned to RDP.
