Unturned requires the use of a Steam Game Server Login Token (GSLT) to run a server.
You also need to connect using a Server Code, rather than using your Server Address & Port.
1. Log into the Pterodactyl panel and open your server
2. Head to the Startup Page
3. Create a Game Server Login Token (GSLT) in Steam - https://steamcommunity.com/dev/managegameservers and paste this into the GSLT field
4. Head to the console page and restart your server
5. Your server code will show in the console, once the game has started up
6. Use the "Connect Directly" option on the main menu of Unturned to join your server. Enter your server code (and password if applicable)
