CSO2 match stuck at 10% loading
If the lobby opens but a match stalls, use the game log to identify the failing connection and compare it on another network.
Check where the connection stops
If the lobby and room list open, your account may already be signed in. The client opens a separate connection to the game server when a match starts. If loading stops at 10%, check the log for repeated Try connect, Get challenge and Retrying lines.
Compare networks
If possible, try once on the same computer using a different network. If it only happens at an internet café, ask the network administrator whether UDP packets can reach the match server and receive a reply. Keep the firewall enabled.
What caused one real 10% loading failure?
In an internet café test, requests reached the server but replies went to the client’s previous UDP port. The server was updated to reply to the port the request came from, and the player joined the match. When reporting a similar issue, include the time, region, map and repeated log lines. Remove passwords and session tokens.