Warframe uses UPnP or NAT-PMP in order to automatically open the ports needed for playing games and communicating with friends.
To enable UPnP or NAT-PMP in Warframe:
1. Open the Main Menu([ESC] on PC), select OPTIONS, then GAMEPLAY.
2. Enable UPnP and/or NAT-PMP
3. Click Confirm
Please make sure UPnP or NAT-PMP is also enabled on your router. If you do not know how to access your router's settings, please contact your router manufacturer or your Internet Service Provider for instructions on how to enable it on your device.
Note: Consoles do not have this option. Please click here if you are using consoles.