If the game launches but fails when joining a lobby, your router or ISP might be blocking the necessary ports.
| Cause Category | Specific Reason | |----------------|----------------| | | Official matchmaking servers are offline, under maintenance, or experiencing high load. | | Network Address Translation (NAT) | Strict or moderate NAT type prevents peer-to-peer (P2P) connections. | | Firewall / Antivirus | Software blocks the game’s executable or required ports. | | Port forwarding | Required UDP/TCP ports are not open on the router. | | Game version mismatch | Host and client have different game updates or DLC packs. | | Steam / platform issues | Steam’s networking layer, overlay, or download region conflicts. | | Save data corruption | Corrupted local profile can block matchmaking. | sniper elite 3 connection to the game failed top