If joining fails
“Server packages file not found” is a content-setup problem, not a firewall problem. Both server_packages.sii and server_packages.dat must be in .local/share/American Truck Simulator beside server_config.sii. Keep the existing assigned ports.
- Open Console and wait for the game or world to finish loading. Save the first error if startup stops.
- Use the joining method above with one client on the matching game version and required content.
- If entry is rejected, compare the exact error with the password, edition, map or authentication checks above. Keep the working save while testing.
Related guides
Fix missing server packages on an American Truck Simulator server
Documentation
Server configuration reference · Project documentation 2
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