Edit your GridCommon.ini and add this section
{L_CODE}:
[AuthorizationService]
; If you have regions with access restrictions
; specify them here using the convention
; Region_<Region_Name> = <flags>
; Valid flags are:
; DisallowForeigners -- HG visitors not allowed
; DisallowResidents -- only Admins and Managers allowed
; Example:
Region_Your_Region_Name = "DisallowForeigners"
Replace the Your_Region_Name part with the name of your region.
i.e. if your region was named 'Welcome' it would be 'Region_Welcome'