diff --git a/src/config-loader.js b/src/config-loader.js
index 86b88f8..5b2d1ab 100644
--- a/src/config-loader.js
+++ b/src/config-loader.js
@@ -324,6 +324,11 @@
   }
 
   function applyConfig(config) {
+    if (isServerUnreachable(config)) {
+      showServerUnavailable();
+      throw new Error('خطا در برقراری ارتباط با سرور');
+    }
+
     window.__APP_CONFIG__ = config || {};
     window.__CONFIG_READY__ = true;
 
@@ -344,6 +349,25 @@
     }
   }
 
+  function isServerUnreachable(config) {
+    if (!config || typeof config !== 'object') return false;
+    if (config.server_reachable === false) return true;
+    if (config.user && config.user.server_reachable === false) return true;
+    return false;
+  }
+
+  function showServerUnavailable() {
+    var appRoot = document.querySelector('#app') || document.body;
+    appRoot.innerHTML =
+      '<div style="min-height:100vh;display:flex;align-items:center;justify-content:center;direction:rtl;font-family:sans-serif;padding:24px;background:#fff;color:#111827;">' +
+      '<div style="width:min(420px,100%);text-align:center;border:1px solid rgba(15,23,42,0.08);border-radius:24px;padding:28px 22px;">' +
+      '<div style="font-size:42px;margin-bottom:12px;">⚠️</div>' +
+      '<h2 style="margin:0 0 12px;font-size:20px;">خطا در برقراری ارتباط با سرور</h2>' +
+      '<p style="margin:0 0 20px;color:rgba(15,23,42,0.62);line-height:2;font-size:14px;">لطفاً چند لحظه دیگر دوباره تلاش کنید.</p>' +
+      '<button type="button" onclick="location.reload()" style="padding:11px 22px;border:0;border-radius:12px;background:#2563eb;color:#fff;cursor:pointer;font-weight:700;">تلاش مجدد</button>' +
+      '</div></div>';
+  }
+
   function finishConfigLoad(config, error) {
     if (configResolve) {
       configResolve(config);
@@ -406,15 +430,24 @@
       console.log('Config loaded successfully from', url, config);
       finishConfigLoad(config);
     } catch (error) {
+      if (error && String(error.message || '').includes('خطا در برقراری ارتباط با سرور')) {
+        showServerUnavailable();
+        return;
+      }
       console.warn('Config loader: Could not fetch config from any endpoint');
       console.warn('Error details:', error && error.message ? error.message : error);
       console.warn('App will continue with empty/cached config.');
 
       const cachedConfig = readCachedAppConfig();
       if (cachedConfig) {
-        applyConfig(cachedConfig);
-        finishConfigLoad(cachedConfig, error);
-        return;
+        try {
+          applyConfig(cachedConfig);
+          finishConfigLoad(cachedConfig, error);
+          return;
+        } catch (blockedError) {
+          showServerUnavailable();
+          return;
+        }
       }
 
       window.__APP_CONFIG__ = {};
@@ -439,6 +472,10 @@
     if (!mainScriptLoaded) {
       console.warn('Config loader: Timeout reached. Loading main.ts with empty/cached config.');
       const cachedConfig = readCachedAppConfig();
+      if (isServerUnreachable(cachedConfig) || isServerUnreachable(window.__APP_CONFIG__)) {
+        showServerUnavailable();
+        return;
+      }
       window.__APP_CONFIG__ = cachedConfig || window.__APP_CONFIG__ || {};
       window.__CONFIG_READY__ = true;
 
diff --git a/src/core/utils/useAxios.ts b/src/core/utils/useAxios.ts
index fb8b38a..b8dc45b 100644
--- a/src/core/utils/useAxios.ts
+++ b/src/core/utils/useAxios.ts
@@ -4,6 +4,10 @@ import axios from 'axios'
 import type { AxiosRequestConfig, AxiosResponse } from 'axios'
 // import { useRouter, useRoute } from 'vue-router'
 import { getToken, removeToken } from '@/utils/index'
+import {
+  hideServerUnavailableOverlay,
+  showServerUnavailableOverlay,
+} from '@/utils/serverUnavailable'
 import { message } from 'ant-design-vue'
 //import { isToken } from '@/utils/is'
 //import router from '@/router'
@@ -69,6 +73,7 @@ _axios.interceptors.response.use(
     // Any status code that lie within the range of 2xx cause this function to trigger
     // Do something with response data
     //console.log('this is fulfilled on interceptors.response', response.data)
+    hideServerUnavailableOverlay()
     return response.data
   },
   async function (error) {
@@ -79,6 +84,10 @@ _axios.interceptors.response.use(
     }*/
     //console.log('this is error on interceptors.response', error.config.meta)
     //console.log('1111111111', error.response)
+    if (error.response && error.response.status == 503) {
+      showServerUnavailableOverlay('خطا در برقراری ارتباط با سرور')
+      return Promise.reject(error)
+    }
     if (error.response && error.response.status == 401) {
       ///removeToken()
       console.log('error')
diff --git a/src/utils/serverUnavailable.ts b/src/utils/serverUnavailable.ts
new file mode 100644
index 0000000..80ed6cf
--- /dev/null
+++ b/src/utils/serverUnavailable.ts
@@ -0,0 +1,57 @@
+const OVERLAY_ID = 'sa-server-unavailable-overlay'
+const MESSAGE = 'خطا در برقراری ارتباط با سرور'
+
+export function isServerUnreachableConfig(config: unknown): boolean {
+  if (!config || typeof config !== 'object') return false
+  const root = config as Record<string, unknown>
+  const user =
+    root.user && typeof root.user === 'object'
+      ? (root.user as Record<string, unknown>)
+      : null
+
+  if (root.server_reachable === false) return true
+  if (user && user.server_reachable === false) return true
+  return false
+}
+
+export function showServerUnavailableOverlay(message = MESSAGE) {
+  if (typeof document === 'undefined') return
+  let root = document.getElementById(OVERLAY_ID)
+  if (!root) {
+    root = document.createElement('div')
+    root.id = OVERLAY_ID
+    document.body.appendChild(root)
+  }
+
+  root.innerHTML = `
+    <div style="position:fixed;inset:0;z-index:2147483000;display:flex;align-items:center;justify-content:center;direction:rtl;font-family:sans-serif;padding:24px;background:#ffffff;color:#111827;">
+      <div style="width:min(420px,100%);text-align:center;background:#fff;border:1px solid rgba(15,23,42,0.08);border-radius:24px;padding:28px 22px;">
+        <div style="font-size:42px;margin-bottom:12px;">⚠️</div>
+        <h2 style="margin:0 0 12px;font-size:20px;">${message}</h2>
+        <p style="margin:0 0 20px;color:rgba(15,23,42,0.62);line-height:2;font-size:14px;">
+          لطفاً چند لحظه دیگر دوباره تلاش کنید.
+        </p>
+        <button
+          type="button"
+          onclick="location.reload()"
+          style="padding:11px 22px;border:0;border-radius:12px;background:#2563eb;color:white;cursor:pointer;font-weight:700;"
+        >
+          تلاش مجدد
+        </button>
+      </div>
+    </div>
+  `
+}
+
+export function hideServerUnavailableOverlay() {
+  if (typeof document === 'undefined') return
+  const root = document.getElementById(OVERLAY_ID)
+  if (root) root.remove()
+}
+
+export function assertServerReachableConfig(config: unknown) {
+  if (isServerUnreachableConfig(config)) {
+    showServerUnavailableOverlay()
+    throw new Error(MESSAGE)
+  }
+}