Multiplayer error messages
- "WARNING: Shader Unsupported"
- "Client and server disagree on asset [...] configuration."
- "Built-in resources mismatch."
- "Your Steam username contains invalid letters" and other naming restrictions
- "The Steam authentication servers are not responding."
- "You are banned from playing on VAC secure servers."
- "This server lost your connection."
- "This server did not respond after accepting you from the queue."
- "This server is running a different inventory version."
- "The game server did not receive a response from the Steam economy servers."
- "The game server did not receive a response from the Steam authentication servers."
- "You are banned from playing multiplayer."
- "The Steam anticheat servers are not responding."
- "The game server did not receive a response from the Steam groups servers."
- "This server is using modified code."
- "This server is using a modified version of the map."
- "This server is running a map you don't have."
- "Lost connection to host or Steam network."
- "Your client and the server disagree about whether you have Gold."