The server is still starting

First-time setup or world generation can take several minutes, especially for a Large world. Follow the status and Console output on the server page. Wait for the server to finish starting before trying to connect.

I cannot connect

Check the address and port in Overview. Use the address shown for this Terraria server, not a port from another game or an old screenshot. Confirm that the server is running and ready, and that your game client matches the server version shown in its startup output. New servers use Terraria 1.4.5.8; existing servers keep their current runtime.

If the game asks for a password, reveal the current password in Overview or ask the owner. After a password change, restart the server and share the new value. If one player can join and another cannot, compare their game versions and the exact address, port, and password they entered.

The server stops during startup

Open Console and find the first error before the shutdown message. If this started after a plugin change, stop the server and disable the newest plugin. Start again. If needed, restore the previous plugin version or restore a full-server backup from before the change.

Only use TShock plugins that match the server's Terraria and TShock versions. Check whether the plugin requires another file or setting. tModLoader mods cannot be loaded by this TShock server.

The wrong world loads

Stop the server, open Worlds, and check which world is selected. Choose the intended save and start again. If the world list does not show the file you expect, confirm that it is a Terraria .wld file and that the upload finished successfully.

Settings did not change

Choose Save All in Settings, then restart the server. World size and world difficulty apply when a world is created; they do not change an existing world.

Ask for help

If the problem continues, note the time, server status, last relevant Console message, and the change that happened just before the issue. Do not include your password or private account details in a public post.