diff --git a/tests/auto_refresh.test.cjs b/tests/auto_refresh.test.cjs
new file mode 100644
index 0000000..a84b07b
--- /dev/null
+++ b/tests/auto_refresh.test.cjs
@@ -0,0 +1,89 @@
+const { test } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const vm = require('node:vm');
+
+function harness() {
+    const events = new Map(), storage = new Map(), warnings = [], timers = new Map();
+    let extension, reloads = 0;
+    const api = {
+        addEventListener: (name, fn) => events.set(name, fn),
+        fetchApi: async () => ({ ok: true, json: async () => ({ revision: '200', user_id: 'a' }) }),
+    };
+    const app = {
+        isGraphReady: true,
+        graphToPrompt: async () => ({ workflow: { nodes: [] } }),
+        extensionManager: {
+            workflow: { openWorkflows: [] },
+            toast: { add: item => warnings.push(item) },
+            setting: { settings: {} },
+        },
+        registerExtension: value => { extension = value; },
+    };
+    const sessionStorage = {
+        getItem: key => storage.get(key), setItem: (key, value) => storage.set(key, value),
+        removeItem: key => storage.delete(key),
+    };
+    const source = fs.readFileSync(require.resolve('../web/js/autoRefresh.js'), 'utf8')
+        .replace(/^import .*;\r?\n/gm, '')
+        .replace('import.meta.url', JSON.stringify('http://localhost/autoRefresh.js?am_revision=100'));
+    vm.runInNewContext(source, {
+        app, api, sessionStorage, URL, AbortSignal, console: { error() {} },
+        setTimeout: fn => { const id = {}; timers.set(id, fn); return id; },
+        clearTimeout: id => timers.delete(id),
+        window: { addEventListener() {}, location: { reload: () => reloads++ } },
+        document: { addEventListener() {} },
+    });
+    extension.setup();
+    return { app, api, warnings, storage, sessionStorage, events, reloads: () => reloads };
+}
+
+test('server unavailable does not warn or reload', async () => {
+    const h = harness();
+    h.api.fetchApi = async () => { throw new TypeError('Failed to fetch'); };
+    await h.events.get('reconnected')();
+    assert.equal(h.warnings.length, 0);
+    assert.equal(h.reloads(), 0);
+});
+
+for (const fail of [true, false]) {
+    test(`disconnect during snapshot (${fail ? 'failure' : 'success'}) waits for reconnect`, async () => {
+        const h = harness();
+        h.app.graphToPrompt = async () => {
+            h.events.get('reconnecting')?.();
+            if (fail) throw new TypeError('Failed to fetch');
+            return { workflow: { nodes: [] } };
+        };
+        await h.events.get('reconnected')();
+        assert.equal(h.warnings.length, 0);
+        assert.equal(h.reloads(), 0);
+        assert.equal(h.storage.has('AccountManager.RefreshRevision'), false);
+        h.app.graphToPrompt = async () => ({ workflow: { nodes: [] } });
+        await h.events.get('reconnected')();
+        assert.equal(h.reloads(), 1);
+    });
+}
+
+test('real local storage failure still pauses refresh', async () => {
+    const h = harness();
+    h.sessionStorage.setItem = () => { throw new Error('Quota exceeded'); };
+    await h.events.get('reconnected')();
+    await h.events.get('reconnected')();
+    assert.equal(h.warnings.length, 1);
+    assert.equal(h.reloads(), 0);
+});
+
+test('disconnect while version response is pending discards the response', async () => {
+    const h = harness();
+    const fetch = h.api.fetchApi;
+    h.api.fetchApi = async () => {
+        h.events.get('reconnecting')();
+        return fetch();
+    };
+    await h.events.get('reconnected')();
+    assert.equal(h.reloads(), 0);
+    assert.equal(h.warnings.length, 0);
+    h.api.fetchApi = fetch;
+    await h.events.get('reconnected')();
+    assert.equal(h.reloads(), 1);
+});
diff --git a/web/js/autoRefresh.js b/web/js/autoRefresh.js
index 0f7285e..de687fa 100644
--- a/web/js/autoRefresh.js
+++ b/web/js/autoRefresh.js
@@ -8,6 +8,8 @@ let busy = false;
 let pending = false;
 let reloading = false;
 let paused = false;
+let disconnected = false;
+let connectionEpoch = 0;
 let retryTimer;
 
 function readStored(key) {
@@ -80,7 +82,7 @@ async function restoreWorkflows(info) {
 }
 
 async function checkForUpdate() {
-    if (reloading || paused) return;
+    if (reloading || paused || disconnected) return;
     if (busy) {
         pending = true;
         return;
@@ -91,6 +93,7 @@ async function checkForUpdate() {
         return;
     }
     busy = true;
+    const epoch = connectionEpoch;
     try {
         let info;
         try {
@@ -102,13 +105,16 @@ async function checkForUpdate() {
         } catch {
             return; // A stopped server or expired login must not trigger a reload.
         }
+        if (epoch !== connectionEpoch || disconnected) return;
         if (!/^\d+$/.test(info.revision) || !info.user_id) return;
         try {
             await restoreWorkflows(info);
         } catch (error) {
+            if (epoch !== connectionEpoch || disconnected) return;
             pauseRefresh("工作流恢复未完成，备份已保留。请先检查并保存当前工作流。", error);
             return;
         }
+        if (epoch !== connectionEpoch || disconnected) return;
         let seen;
         try {
             seen = readStored(SEEN_KEY);
@@ -125,9 +131,11 @@ async function checkForUpdate() {
         if (BigInt(info.revision) <= baseline) return;
         try {
             const backup = await snapshotWorkflows(info);
+            if (epoch !== connectionEpoch || disconnected) return;
             sessionStorage.setItem(BACKUP_KEY, JSON.stringify(backup));
             sessionStorage.setItem(SEEN_KEY, JSON.stringify({ revision: info.revision, user_id: info.user_id }));
         } catch (error) {
+            if (epoch !== connectionEpoch || disconnected) return;
             pauseRefresh("无法安全暂存工作流，请先保存后手动刷新。", error);
             return;
         }
@@ -148,7 +156,18 @@ async function checkForUpdate() {
 app.registerExtension({
     name: "ComfyUI.AccountManager.AutoRefresh",
     setup() {
-        api.addEventListener("reconnected", checkForUpdate);
+        // ComfyUI already displays connection status; do not add a save warning while offline.
+        const onDisconnect = () => {
+            disconnected = true;
+            connectionEpoch++;
+            clearTimeout(retryTimer);
+        };
+        api.addEventListener("reconnecting", onDisconnect);
+        window.addEventListener("offline", onDisconnect);
+        api.addEventListener("reconnected", () => {
+            disconnected = false;
+            return checkForUpdate();
+        });
         window.addEventListener("online", checkForUpdate);
         window.addEventListener("pageshow", checkForUpdate);
         document.addEventListener("visibilitychange", () => {