Private Lobby GTA5 Online tool. It Automatically sets the appropriate Windows Firewall Rules to Whitelist your Friends from the DigitalArc Guardian tool and prevent others from joining your session (if you are the host).
Please post your feedback here as a comment. Thanks.
If it does not work, please look into the data.json and also tell me if the IPs are IP4 or IP6. The path to it is shown when you enable the Firewall rules.
IP4 look like this: xxx.xxx.xxx.xxx
IP6 look like this: xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx