diff --git a/backend/src/index.js b/backend/src/index.js
index 355e0673..055aa8d3 100644
--- a/backend/src/index.js
+++ b/backend/src/index.js
@@ -26,6 +26,6 @@ try {
   console.error('Failed to initialize WebSocket server:', error);
 }
 
-app.listen(PORT, () => {
+server.listen(PORT, () => {
   console.log(`Server is running on http://localhost:${PORT}`);
 });
diff --git a/backend/src/websocketServer.js b/backend/src/websocketServer.js
index de324c78..e2f71fd7 100644
--- a/backend/src/websocketServer.js
+++ b/backend/src/websocketServer.js
@@ -1,9 +1,25 @@
 import { WebSocketServer } from 'ws';
 
 const activeConnections = {}; // token별로 연결을 관리하기 위한 객체
+const clientLocations = {};
 
 export const initializeWebSocketServer = server => {
-  const wss = new WebSocketServer({ server });
+  const wss = new WebSocketServer({
+    server,
+    verifyClient: (info, done) => {
+      const { origin } = info;
+
+      if (origin === 'http://localhost:5173') {
+        done(true);
+      } else {
+        done(false, 403, 'Forbidden: Origin not allowed');
+      }
+    },
+  });
+
+  wss.on('error', err => {
+    console.error('WebSocket Server Error:', err);
+  });
 
   wss.on('connection', (ws, req) => {
     // URL에서 token 추출
@@ -26,9 +42,40 @@ export const initializeWebSocketServer = server => {
 
     console.log(`Client connected with token: ${token}`);
 
+    // 새 클라이언트에게 기존 클라이언트의 위치 전송
+    ws.send(
+      JSON.stringify({
+        type: 'init',
+        clients: Object.entries(clientLocations).map(([clientToken, location]) => ({
+          token: clientToken,
+          location,
+        })),
+      }),
+    );
+
     // 클라이언트로부터 메시지 받았을 때의 이벤트 처리
     ws.on('message', message => {
-      console.log(`Received from ${token}:`, message);
+      try {
+        const data = JSON.parse(message);
+        if (data.type === 'location' && data.location) {
+          clientLocations[token] = data.location;
+
+          // 모든 클라이언트에게 위치 정보 전송
+          Object.keys(activeConnections).forEach(otherToken => {
+            if (activeConnections[otherToken].readyState === ws.OPEN) {
+              activeConnections[otherToken].send(
+                JSON.stringify({
+                  type: 'location',
+                  token,
+                  location: data.location,
+                }),
+              );
+            }
+          });
+        }
+      } catch (err) {
+        console.error('Invalid message format:', err);
+      }
     });
 
     // 클라이언트 연결 종료 시
@@ -36,6 +83,7 @@ export const initializeWebSocketServer = server => {
       console.log(`Client disconnected with token: ${token}, Code: ${code}, Reason: ${reason}`);
       // 연결이 종료되면 activeConnections에서 해당 token 제거
       delete activeConnections[token];
+      delete clientLocations[token];
     });
   });
 };
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index a7e44f41..345dbd45 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -5,4 +5,7 @@ import tsconfigPaths from 'vite-tsconfig-paths'; // 추가된 부분
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react(), tsconfigPaths()], // tsconfigPaths 플러그인 추가
+  server: {
+    hmr: false, // HMR 완전히 비활성화
+  },
 });