Running the Node.
Linux
The first that we need is to get the latest version of Grin++ by download it directly from the github release page. Right now, the latest version is v1.2.6.beta1:
After getting the link of the .AppImage file we can proceed to download the file using wget:
$ wget "https://github.com/GrinPlusPlus/GrinPlusPlus/releases/download/v1.2.6-beta.1/GrinPlusPlus-1.2.6-beta.1.AppImage"
Give execution permissions now:
$ chmod a+x GrinPlusPlus-1.2.6-beta.1.AppImage
Extract the content of the file like this:
$ ./GrinPlusPlus-1.2.6-beta.1.AppImage --appimage-extract
This will extract the content to a folder with the name: squashfs-root. Now we need to copy the node binary to wherever we want, I’m using /usr/local/sbin/ since this folder is part of my PATH environment variable:
$ mv squashfs-root/resources/app.asar.unpacked/bin/GrinNode /usr/local/sbin/
Now, using nohup we will run the node to make sure we can logout without killing the process:
$ nohup GrinNode > /dev/null 2>&1 &
Now, we can check whether GrinNode is running by executing the top command:
Windows
On Windows, you just need to run Grin++ 
or run just the backend by executing the GrinNode.exe file located here: %LocalAppData%\Programs\GrinPlusPlus\resources\app.asar.unpacked\bin.
Port Forwarding.
Now, we just need to forward port 3414 to our machine, and permit all traffic port 3414. On Linux, you may need to add a rule to iptables.