diff --git a/scripts/gate-4-startup.ps1 b/scripts/gate-4-startup.ps1
index dd4da5c2..ec71862b 100644
--- a/scripts/gate-4-startup.ps1
+++ b/scripts/gate-4-startup.ps1
@@ -49,9 +49,11 @@ if (-not $SkipDbUp) {
 Write-Host "[3/3] Starting Host (DEBUG mode)..." -ForegroundColor Yellow
 Write-Host ""
 
-# Set required environment variables
-$env:KARTSELL_POSTGRES = "Host=localhost;Port=5432;Database=kartsell;Username=kartsell;Password=kartsell"
-$env:KRX_OPENAPI = "stub-key-for-testing"
+# Set required environment variables (must match appsettings.json)
+$env:ASPNETCORE_ENVIRONMENT = "Development"  # Load appsettings.Development.json (DevelopmentHeaderAuthenticationHandler)
+$env:KARTSELL_POSTGRES = "Host=127.0.0.1;Port=5432;Database=kartselldb;Username=kartsell;Password=kartsell4321@!"
+$env:KRX_API_KEY = "stub-key-for-testing"
+$env:OPENDART_API = "stub-key-for-testing"
 
 # Display startup info
 Write-Host "Configuration: $Environment" -ForegroundColor Cyan