diff --git a/scripts/cluster/migrate-production.sh b/scripts/cluster/migrate-production.sh
index 7b4040f..68372cc 100755
--- a/scripts/cluster/migrate-production.sh
+++ b/scripts/cluster/migrate-production.sh
@@ -138,9 +138,17 @@ chmod 0600 "$old_site_backup"
 install -m 0644 /etc/nginx/sites-available/ai.51easyai.com-maintenance "$active_site"
 nginx -t
 systemctl reload nginx
-curl -ksS --resolve ai.51easyai.com:443:127.0.0.1 \
-  -o /dev/null -w '%{http_code}' https://ai.51easyai.com/api/v1/healthz |
-  grep -qx 503
+maintenance_code=
+for _ in $(seq 1 15); do
+  maintenance_code=$(curl -ksS --resolve ai.51easyai.com:443:127.0.0.1 \
+    -o /dev/null -w '%{http_code}' https://ai.51easyai.com/api/v1/healthz || true)
+  [[ $maintenance_code == 503 ]] && break
+  sleep 1
+done
+[[ $maintenance_code == 503 ]] || {
+  echo "maintenance NGINX did not become active: HTTP $maintenance_code" >&2
+  exit 1
+}
 
 docker stop --time 60 easyai-ai-gateway-api-1 >/dev/null
 postgres_user=$(docker inspect easyai-ai-gateway-postgres-1 \