Synology TUN creation instruction - I get permission denied

When I follow the instruction to create a persistent TUN and check for the tunnel, cmd /dev/net/tun

I get -ash: /dev/net/tun: Permission denied

I have followed a couple of instructions how to restore the tunnel and have not been successful. Is this a common problem with a simple fix?

You need to understand what are you doing and not just copy/paste everything.

Check for the TUN

ls /dev/net/tun    <-- this is the command you supposed to run
/dev/net/tun       <-- this is the expected output of the above command

Thank you @AndrewZ, I agree, I do learn albeit at a slower pace than most.