Or manually:
Corrupt files within the Steam directory can cause issues. To verify Steam files: steam master server updater could not be located
Steam has a built-in feature to verify the integrity of its files. Here's how you can use it: Or manually: Corrupt files within the Steam directory
Clearing the Steam cache can also help:
Add an exception for your server executable (e.g., srcds.exe ) in Windows Firewall. steam master server updater could not be located
sv_master1 "hl2master.steampowered.com" sv_master2 "hl2master.steampowered.com" sv_master3 "hl2master.steampowered.com"