diff --git a/backend/__pycache__/models.cpython-313.pyc b/backend/__pycache__/models.cpython-313.pyc
index 1993280..e56ca32 100644
Binary files a/backend/__pycache__/models.cpython-313.pyc and b/backend/__pycache__/models.cpython-313.pyc differ
diff --git a/backend/main.py b/backend/main.py
index 3a38e8a..f933d25 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -38,7 +38,7 @@ app = Flask(__name__)
 
 # CORS(app, resources={r"/api/*": {"origins": "http://127.0.0.1:5500"}}, supports_credentials=True, expose_headers='Content-Disposition')
 
-CORS(app, resources={r"/api/*": {"origins": ["http://192.168.1.8:5500","http://127.0.0.1:5500"]}}, supports_credentials=True, expose_headers='Content-Disposition')
+CORS(app, resources={r"/api/*": {"origins": ["http://192.168.1.12:5500","http://127.0.0.1:5500"]}}, supports_credentials=True, expose_headers='Content-Disposition')
 
 # CORS(app, resources={r"/api/*": {"origins": "http://localhost:5173"}})               , "http://127.0.0.1:5500"
 # This tells Flask: "For any route starting with /api/, allow requests
@@ -484,5 +484,5 @@ if __name__ == '__main__':
     mqtt_thread = threading.Thread(target=start_mqtt_clients, daemon=True)
     mqtt_thread.start()
     
-    print(f"Starting Flask-SocketIO server on http://192.168.1.8:5000")
-    socketio.run(app, host='192.168.1.8', port=5000)
+    print(f"Starting Flask-SocketIO server on http://192.168.1.12:5000")
+    socketio.run(app, host='192.168.1.12', port=5000)
diff --git a/frontend/analytics.html b/frontend/analytics.html
index 0dffba5..d0d9bf6 100644
--- a/frontend/analytics.html
+++ b/frontend/analytics.html
@@ -5,6 +5,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>Swap Station – Analytics</title>
 
+  <script src="js/auth-guard.js"></script>
+
   <!-- Inter + Tailwind -->
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
diff --git a/frontend/dashboard.html b/frontend/dashboard.html
index 9d7b595..b9c40e9 100644
--- a/frontend/dashboard.html
+++ b/frontend/dashboard.html
@@ -5,6 +5,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>Swap Station – Dashboard</title>
 
+  <script src="js/auth-guard.js"></script>
+
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap" rel="stylesheet">
diff --git a/frontend/js/auth-guard.js b/frontend/js/auth-guard.js
new file mode 100644
index 0000000..85c78d9
--- /dev/null
+++ b/frontend/js/auth-guard.js
@@ -0,0 +1,11 @@
+(function() {
+    // Get the user from localStorage
+    const user = localStorage.getItem('user');
+
+    // Check if the user object exists. If not, redirect to the login page.
+    if (!user) {
+        // Use window.location.replace() to prevent the user from clicking the "back" button
+        // and re-accessing the protected page.
+        window.location.replace('/frontend/index.html');
+    }
+})();
\ No newline at end of file
diff --git a/frontend/js/auth.js b/frontend/js/auth.js
index 9fbbc64..065cc38 100644
--- a/frontend/js/auth.js
+++ b/frontend/js/auth.js
@@ -11,7 +11,7 @@ document.addEventListener('DOMContentLoaded', () => {
     const password = document.getElementById('password').value;
 
     try {
-      const response = await fetch('http://192.168.1.8:5000/api/login', {
+      const response = await fetch('http://192.168.1.12:5000/api/login', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({ username, password }),
diff --git a/frontend/js/dashboard.js b/frontend/js/dashboard.js
index 0d744b2..cb94596 100644
--- a/frontend/js/dashboard.js
+++ b/frontend/js/dashboard.js
@@ -1,7 +1,7 @@
 document.addEventListener('DOMContentLoaded', () => {
     // --- CONFIGURATION ---
-    const SOCKET_URL = "http://192.168.1.8:5000";
-    const API_BASE = "http://192.168.1.8:5000/api"; // Added for API calls
+    const SOCKET_URL = "http://192.168.1.12:5000";
+    const API_BASE = "http://192.168.1.12:5000/api"; // Added for API calls
 
     // --- DOM ELEMENT REFERENCES ---
     const grid = document.getElementById('chambersGrid');
diff --git a/frontend/js/logs.js b/frontend/js/logs.js
index 8d3512f..81cfab9 100644
--- a/frontend/js/logs.js
+++ b/frontend/js/logs.js
@@ -1,7 +1,7 @@
 document.addEventListener('DOMContentLoaded', () => {
     // --- CONFIGURATION ---
-    const SOCKET_URL = "http://192.168.1.8:5000";
-    const API_BASE = "http://192.168.1.8:5000/api";
+    const SOCKET_URL = "http://192.168.1.12:5000";
+    const API_BASE = "http://192.168.1.12:5000/api";
 
     // --- DOM ELEMENT REFERENCES ---
     const stationNameEl = document.getElementById('station-name');
diff --git a/frontend/js/station_selection.js b/frontend/js/station_selection.js
index fff3eb6..eb1d47b 100644
--- a/frontend/js/station_selection.js
+++ b/frontend/js/station_selection.js
@@ -86,7 +86,7 @@ document.addEventListener('DOMContentLoaded', () => {
     // --- DATA FETCHING & STATUS POLLING ---
     const loadAndPollStations = async () => {
         try {
-            const response = await fetch('http://192.168.1.8:5000/api/stations');
+            const response = await fetch('http://192.168.1.12:5000/api/stations');
             if (!response.ok) throw new Error('Failed to fetch stations');
             const stations = await response.json();
             
diff --git a/frontend/logs.html b/frontend/logs.html
index f6a3aac..df80f5c 100644
--- a/frontend/logs.html
+++ b/frontend/logs.html
@@ -5,10 +5,13 @@
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>Swap Station – Logs</title>
 
+  <script src="js/auth-guard.js"></script>
+
   <!-- Font + Tailwind -->
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap" rel="stylesheet">
+
   <script src="https://cdn.tailwindcss.com"></script>
   <script>
     tailwind.config = {
diff --git a/frontend/station_selection.html b/frontend/station_selection.html
index f44abf8..fc8da1c 100644
--- a/frontend/station_selection.html
+++ b/frontend/station_selection.html
@@ -5,6 +5,8 @@
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>Swap Station – Select a Station</title>
 
+  <script src="js/auth-guard.js"></script>
+
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap" rel="stylesheet">
@@ -195,7 +197,7 @@
   </div>
 
   <script>
-    const API_BASE = 'http://192.168.1.8:5000/api';
+    const API_BASE = 'http://192.168.1.12:5000/api';
 
     const grid = document.getElementById('stations-grid');
     const addStationCardTmpl = document.getElementById('add-station-card-template');
@@ -248,7 +250,7 @@
         location: stationLocation.value.trim(),
         mqtt_broker: mqttBroker.value.trim(),
         mqtt_port: Number(mqttPort.value),
-        mqtt_username: mqttUsername.value || null,
+        mqtt_user: mqttUsername.value || null,
         mqtt_password: mqttPassword.value || null,
       };
       try {