diff --git a/backend/api-gateway/nginx/install-mpc-grpc.sh b/backend/api-gateway/nginx/install-mpc-grpc.sh
index 29bf74f3..774f84f8 100644
--- a/backend/api-gateway/nginx/install-mpc-grpc.sh
+++ b/backend/api-gateway/nginx/install-mpc-grpc.sh
@@ -69,8 +69,9 @@ check_prerequisites() {
 configure_http() {
     log_info "步骤 1/4: 创建临时 HTTP 配置..."
 
-    # 确保 certbot webroot 目录存在
-    mkdir -p /var/www/certbot
+    # 确保 certbot webroot 目录及子目录存在
+    mkdir -p /var/www/certbot/.well-known/acme-challenge
+    chmod -R 755 /var/www/certbot
 
     # 创建临时 HTTP 配置
     cat > /etc/nginx/sites-available/$DOMAIN << EOF