The "Connection to the game failed" error in Sniper Elite 3 often occurs due to firewall restrictions, corrupted game cache, or NAT type issues. To get back into co-op or multiplayer, try these top community-verified fixes:
27015 to 27030 and 27036 to 27037.folder) is explicitly allowed through your Windows Firewall. Sometimes the firewall only white-lists the launcher, which doesn't actually handle the game’s network traffic. Port Forwarding sniper elite 3 connection to the game failed top
For co-op, ensure both players have the game fully loaded to the main menu before sending or accepting an invitation. For Steam users: Forward UDP/TCP ports 27015 to
: Corrupted cache files or missing DLLs can cause the connection to time out during the handshake process. folder) is explicitly allowed through your Windows Firewall