Beginning in version 3.20.4.0 Unturned dedicated servers can be authenticated using a Game Server Login Token or GSLT. After version 3.21.31.0 anonymous servers (without GSLT) are hidden from the internet server list.
An additional benefit of using GSLTs is the automatic transfer of favourites and history if the server address changes.
Creating GSLTs
You can manually create GSLTs while logged in with your Steam account here: https://steamcommunity.com/dev/managegameservers
Use Unturned’s app ID 304930, and a memo to remind you which server the token is for.
Unturned Configuration on ScalaCube
Navigate to the Server section of your ScalaCube control panel.
Select "Manage server" for the specific Unturned server you wish to configure.
On the ensuing page, click "Manage" for the desired server.
In the left menu, choose "Settings," and input your GSLT into the designated setting field.
Automating GSLTs
Valve provides an IGameServersService web API for managing GSLTs. Consult their documentation here: https://partner.steamgames.com/doc/webapi/IGameServersService
Summary:
An additional benefit of using GSLTs is the automatic transfer of favourites and history if the server address changes.
Creating GSLTs
You can manually create GSLTs while logged in with your Steam account here: https://steamcommunity.com/dev/managegameserversUse Unturned’s app ID 304930, and a memo to remind you which server the token is for.
Unturned Configuration on ScalaCube
Navigate to the Server section of your ScalaCube control panel. 
Select "Manage server" for the specific Unturned server you wish to configure.
On the ensuing page, click "Manage" for the desired server.
In the left menu, choose "Settings," and input your GSLT into the designated setting field.
Automating GSLTs
Valve provides an IGameServersService web API for managing GSLTs. Consult their documentation here: https://partner.steamgames.com/doc/webapi/IGameServersService Summary:
- Servers page
- Manage server
- Manage
- Settings page
- GSLT field