CVars < login.realmDataCenterId

Is the realm 'data center' or set of server infrastructure used for connecting client. Account must have access to connect. Used by patch updater and game client.

9 (default) - normal public servers, North America (NA)
7 - publicly exposed test servers
login.realmDataCenterId = 9

UI Edit

Found on the Patch updater window as the 'Region' option in Options

9 - "North America"
7 - "Test [locked]"

Summary Edit

This setting controls which set of servers the client uses to connect for the game. Different sets of servers may run different versions of the game and may require different versions of the client. This setting is often used for public testing on special public test realms, sometimes referred to as PTR.

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