diff --git a/webui/html/assets/js/tabs/containers.js b/webui/html/assets/js/tabs/containers.js
index 9a44007..4538226 100644
--- a/webui/html/assets/js/tabs/containers.js
+++ b/webui/html/assets/js/tabs/containers.js
@@ -420,6 +420,9 @@ let execTerminalState = {
   outputText: '',
   outputLineCount: 0,
   outputTruncated: false,
+  sessionInfo: null,
+  infoPollTimer: null,
+  infoTickTimer: null,
 };
 
 const EXEC_OUTPUT_MAX_CHARS = 200000;
@@ -430,6 +433,8 @@ const EXEC_RECONNECT_BASE_MS = 350;
 const EXEC_RECONNECT_MAX_MS = 5000;
 const EXEC_RECONNECT_MAX_ATTEMPTS = 8;
 const EXEC_PASTE_CHUNK_SIZE = 2048;
+const EXEC_SESSION_INFO_POLL_MS = 7000;
+const EXEC_IDLE_TTL_SECONDS = 60 * 60;
 
 function _execEls() {
   return {
@@ -526,7 +531,73 @@ function _execInitTerminal() {
 
 function _execConnectedStatus() {
   const sid = execTerminalState.sessionId || '';
-  return sid ? `Connected (${sid})` : 'Connected';
+  if (!sid) return 'Connected';
+  const info = execTerminalState.sessionInfo;
+  if (!info) return `Connected (${sid})`;
+  if (info.closed) return `Session closed: ${info.close_reason || 'closed'}`;
+
+  const last = Number(info.last_activity || 0);
+  if (!Number.isFinite(last) || last <= 0) return `Connected (${sid})`;
+  const now = Math.floor(Date.now() / 1000);
+  const idleAge = Math.max(0, now - last);
+  const idleLeft = Math.max(0, EXEC_IDLE_TTL_SECONDS - idleAge);
+  const mm = String(Math.floor(idleLeft / 60)).padStart(2, '0');
+  const ss = String(idleLeft % 60).padStart(2, '0');
+  return `Connected (${sid}) - idle in ${mm}:${ss}`;
+}
+
+function _execStopSessionInfoTimers() {
+  if (execTerminalState.infoPollTimer) {
+    clearInterval(execTerminalState.infoPollTimer);
+    execTerminalState.infoPollTimer = null;
+  }
+  if (execTerminalState.infoTickTimer) {
+    clearInterval(execTerminalState.infoTickTimer);
+    execTerminalState.infoTickTimer = null;
+  }
+}
+
+function _execCanUpdateConnectedStatus() {
+  if (!execTerminalState.sessionId) return false;
+  if (
+    execTerminalState.reconnectEnabled &&
+    execTerminalState.reconnectAttempts > 0 &&
+    !execTerminalState.source
+  ) {
+    return false;
+  }
+  return true;
+}
+
+async function _execRefreshSessionInfo() {
+  const sid = execTerminalState.sessionId;
+  if (!sid) return;
+  try {
+    const info = await api(`/containers/exec/${encodeURIComponent(sid)}`, 'GET');
+    if (sid !== execTerminalState.sessionId) return;
+    execTerminalState.sessionInfo = info || null;
+    if (execTerminalState.sessionInfo?.closed) {
+      execTerminalState.reconnectEnabled = false;
+      _execCancelReconnect();
+      _execCloseEventSource();
+      _execSetStatus(`Session closed: ${execTerminalState.sessionInfo.close_reason || 'closed'}`);
+      _execStopSessionInfoTimers();
+      return;
+    }
+    if (_execCanUpdateConnectedStatus()) _execSetStatus(_execConnectedStatus());
+  } catch (_) {
+    // stream reconnect status has priority
+  }
+}
+
+function _execStartSessionInfoTimers() {
+  _execStopSessionInfoTimers();
+  _execRefreshSessionInfo();
+  execTerminalState.infoPollTimer = setInterval(_execRefreshSessionInfo, EXEC_SESSION_INFO_POLL_MS);
+  execTerminalState.infoTickTimer = setInterval(() => {
+    if (!_execCanUpdateConnectedStatus()) return;
+    _execSetStatus(_execConnectedStatus());
+  }, 1000);
 }
 
 function _execAppendOutput(txt) {
@@ -888,7 +959,9 @@ async function containerExecOpen(name) {
   execTerminalState.sessionId = '';
   execTerminalState.lastSeq = 0;
   execTerminalState.reconnectEnabled = false;
+  execTerminalState.sessionInfo = null;
   _execCancelReconnect();
+  _execStopSessionInfoTimers();
   execTerminalState.rawMode = true;
   _execInitTerminal();
   _execUpdateInputModeUi();
@@ -907,8 +980,10 @@ async function containerExecOpen(name) {
     execTerminalState.sessionId = sid;
     execTerminalState.lastSeq = 0;
     execTerminalState.reconnectEnabled = true;
+    execTerminalState.sessionInfo = null;
     _execSetStatus(`Connected (${sid})`);
     _execAttachStream(0, false);
+    _execStartSessionInfoTimers();
 
     _execScheduleResize();
 
@@ -998,6 +1073,7 @@ async function containerExecClose() {
 
   execTerminalState.reconnectEnabled = false;
   _execCancelReconnect();
+  _execStopSessionInfoTimers();
   _execCloseEventSource();
   _execDestroyTerminal();
   _execSetTerminalUiMode(false);
@@ -1013,6 +1089,7 @@ async function containerExecClose() {
 
   execTerminalState.sessionId = '';
   execTerminalState.lastSeq = 0;
+  execTerminalState.sessionInfo = null;
   if (els.back) els.back.style.display = 'none';
 
   if (sid) {