Since a certain time Rockstar Games no more uses a fixed port range for its games. Instead they use the "Dynamic Port Range" set in Windows.

This makes Port Forwarding useless and it is the main reason for many problems.

At the moment the only way I found is to set temporary this port range to a minimum of 300 Ports. In this command line from 27000 to 27300 (because steam also share this range)

• 6672 UDP
  
• 61455-61458 UDP
  
• 27000-27300 UDP

Start > Windows System > Command Prompt (right click: run as administrator)
(After PC restart this will be reset to default!)

1. Make a new Text document and change the type from .txt to .cmd
   
2. Edit the file
   
   netsh int ipv4 set dynamicportrange protocol=udp startport=27000 numberofports=300 store=active pause netsh int ipv4 set dynamicportrange protocol=udp startport=49152 numberofports=16384 store=active
3. Save it

Now you can always run this script (right click: run as administrator) before you start RDR2. After playing and "Press any key to continue . . ." the Dynamic Port Range will be reset to default (same as restart your PC) and the Console will be close itself.

- Tested on a fresh Windows and should always work. (NAT Type Open)
- NAT Typ can be found in the Social Club InGame Overlay
- Use https://portforward.com/router.htm if you need help with your router.
- Steam should already managed the Windows Firewall. Don't use other firewalls.
- Yes this works also for GTA 5.