diff --git a/app/package.json b/app/package.json
index 5bc0d3e2..dd012b5a 100644
--- a/app/package.json
+++ b/app/package.json
@@ -26,7 +26,7 @@
   "dependencies": {
     "@expo/bunyan": "^1.8.10",
     "@expo/json-file": "^5.0.1",
-    "@expo/ngrok": "2.2.8",
+    "@expo/ngrok": "2.2.9",
     "@exponent/electron-cookies": "^2.0.0",
     "aphrodite": "^1.2.3",
     "autobind-decorator": "^1.3.4",
diff --git a/src/ui/MainScreen.js b/src/ui/MainScreen.js
index 9c7c1a06..033f7535 100644
--- a/src/ui/MainScreen.js
+++ b/src/ui/MainScreen.js
@@ -1162,12 +1162,24 @@ class MainScreen extends React.Component {
     }
   }
 
-  async _computeUrlAsync(root) {
-    if (!root) {
+  async _computeUrlAsync(projectRoot) {
+    if (!projectRoot) {
       return null;
     }
 
-    return UrlUtils.constructManifestUrlAsync(root);
+    const {
+      url,
+      isUrlFallback,
+    } = await Project.getManifestUrlWithFallbackAsync(projectRoot);
+
+    if (isUrlFallback) {
+      this._logError(
+        'Switched to a LAN URL because the tunnel appears to be down. ' +
+          'Only devices in the same network can access the app. ' +
+          'You can restart the project to try reconnecting.'
+      );
+    }
+    return url;
   }
 
   _registerLogs() {