diff --git a/nginx.conf b/nginx.conf
index d109bc5a..db2d5dad 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -1,23 +1,37 @@
+# HTTP로 들어오는 요청을 HTTPS로 Redirect
 server {
-	listen 80 default_server;
-	server_name _;
+    listen 80;
+    server_name denamu.site www.denamu.site;
+
+    return 301 https://$host$request_uri;
+}
+
+# HTTPS로 들어온 요청에 대한 처리 진행
+server {
+    listen 443 ssl;
+    server_name denamu.site www.denamu.site;
+
+    ssl_certificate /etc/letsencrypt/live/denamu.site/fullchain.pem; # managed by Certbot
+    ssl_certificate_key /etc/letsencrypt/live/denamu.site/privkey.pem; # managed by Certbot
+    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
+    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
 
     # 정적 파일 서빙 - FE 빌드 파일
     location / {
         root /var/web05-Denamu/client/dist;
-        index index.html;  # 기본 파일 설정
-        try_files $uri /index.html;  # SPA 지원
+        index index.html;
+        try_files $uri /index.html;
     }
 
     # 정적 파일 서빙
-	location /files {
-		alias /var/web05-Denamu/static/;
-		try_files $uri $uri/ =404; # 파일이 없으면 404 반환
-	}
+    location /files {
+        alias /var/web05-Denamu/static/;
+        try_files $uri $uri/ =404;
+    }
 
     # API 요청을 NestJS로 프록시
     location /api {
-        proxy_pass http://127.0.0.1:8080;  # NestJS 서버
+        proxy_pass http://127.0.0.1:8080;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';
@@ -25,7 +39,7 @@ server {
         proxy_cache_bypass $http_upgrade;
     }
 
-	# WebSocket 요청 프록시
+    # WebSocket 요청 프록시
     location /chat {
         proxy_pass http://127.0.0.1:8080;
         proxy_http_version 1.1;
diff --git a/server/src/main.ts b/server/src/main.ts
index 68a94abb..ca25d073 100644
--- a/server/src/main.ts
+++ b/server/src/main.ts
@@ -20,7 +20,7 @@ async function bootstrap() {
   app.enableCors({
     origin: [
       'http://localhost:5173',
-      'https://denamu.netlify.app',
+      'https://www.denamu.site',
       'https://denamu.site',
     ],
     credentials: true,