diff --git a/welcome.html b/welcome.html
index 794d607..6c734bc 100644
--- a/welcome.html
+++ b/welcome.html
@@ -237,7 +237,7 @@ async function loadDevices() {
   document.getElementById('sys-status').textContent = '\u2705 运行中';
   try {
     var r = await api('GET', '/api/states');
-    if (!r.ok) throw new Error('获取设备失败');
+    if (!r.ok) throw new Error('HTTP ' + r.status + ' ' + r.statusText);
     var states = await r.json();
     document.getElementById('dev-count').textContent = states.length + ' 个实体';
 
@@ -247,7 +247,7 @@ async function loadDevices() {
     });
     document.getElementById('dev-list').innerHTML = html || '<div class="msg">暂无设备，接入硬件后自动发现</div>';
   } catch(e) {
-    document.getElementById('sys-status').textContent = '\u274c 连接失败';
+    document.getElementById('sys-status').textContent = '\u274c ' + e.message;
     document.getElementById('dev-list').innerHTML = '<div class="msg error">' + e.message + '</div>';
   }
 }