diff --git a/src/dashboard/api.js b/src/dashboard/api.js
index 6fc65bc..668cf17 100644
--- a/src/dashboard/api.js
+++ b/src/dashboard/api.js
@@ -123,7 +123,9 @@ async function processWindsurfLogin({ email, password, loginProxy, autoAdd }) {
 /**
  * Handle all /dashboard/api/* requests.
  */
-export async function handleDashboardApi(method, subpath, body, req, res) {
+export async function handleDashboardApi(method, subpath, body, req, res, deps = {}) {
+  const ensureLsForAccountFn = deps.ensureLsForAccount || ensureLsForAccount;
+  const probeAccountFn = deps.probeAccount || probeAccount;
   if (method === 'OPTIONS') return json(res, 204, '');
 
   // Auth check (except for auth verification endpoint)
@@ -288,16 +290,19 @@ export async function handleDashboardApi(method, subpath, body, req, res) {
 
   if (subpath === '/accounts' && method === 'POST') {
     try {
+      // Validate required credentials before any proxy validation/network checks.
       if (!body.api_key && !body.token) {
         return json(res, 400, { error: 'Provide api_key or token' });
       }
 
+      // 1. Validate proxy first (if provided) - fail early before touching account store
       let parsedProxy = null;
       if (body.proxy) {
         parsedProxy = parseProxyUrl(body.proxy);
         if (!parsedProxy) {
           return json(res, 400, { error: 'ERR_PROXY_FORMAT_INVALID' });
         }
+        // Validate proxy host (respect ALLOW_PRIVATE_PROXY_HOSTS config)
         try {
           if (config.allowPrivateProxyHosts) {
             await validateHostFormat(parsedProxy.host);
@@ -309,10 +314,12 @@ export async function handleDashboardApi(method, subpath, body, req, res) {
         }
       }
 
+      // 2. Create account only after proxy validation passes
       const account = body.api_key
         ? addAccountByKey(body.api_key, body.label)
         : await addAccountByToken(body.token, body.label);
 
+      // 3. Bind proxy to the newly created account
       if (parsedProxy) {
         setAccountProxy(account.id, parsedProxy);
         ensureLsForAccount(account.id).catch(e => log.warn(`LS ensure failed: ${e.message}`));
diff --git a/src/dashboard/index.html b/src/dashboard/index.html
index 6fecdd6..31599c1 100644
--- a/src/dashboard/index.html
+++ b/src/dashboard/index.html
@@ -2350,6 +2350,12 @@ <h3 data-i18n="login.title">控制台登录</h3>
     I18n.apply();
   },
 
+  translateError(errorCode, fallbackKey = 'error.unknown') {
+    const errKey = errorCode ? `error.${errorCode}` : '';
+    if (errKey && I18n.t(errKey) !== errKey) return I18n.t(errKey);
+    return errorCode || I18n.t(fallbackKey);
+  },
+
   async toggleLang() {
     const newLang = I18n.locale === 'zh' || I18n.locale === 'zh-CN' ? 'en' : 'zh';
     await I18n.setLocale(newLang);
@@ -2854,10 +2860,10 @@ <h3 data-i18n="login.title">控制台登录</h3>
         input.value = '';
         this.loadAccounts();
       } else {
-        this.toast(r.error || I18n.t('toast.addFailed'), 'error');
+        this.toast(this.translateError(r.error, 'toast.addFailed'), 'error');
       }
     } catch (err) {
-      this.toast(err.message, 'error');
+      this.toast(this.translateError(err.message, 'error.unknown'), 'error');
     } finally {
       if (btn) btn.disabled = originalDisabled || false;
     }
@@ -3433,7 +3439,7 @@ <h3 data-i18n="login.title">控制台登录</h3>
         this.toast(I18n.t('toast.credits.refreshed'));
         this.loadAccounts();
       } else {
-        this.toast(r.error || I18n.t('toast.credits.refreshFailed'), 'error');
+        this.toast(this.translateError(r.error, 'toast.credits.refreshFailed'), 'error');
       }
     } catch (e) { this.toast(I18n.t('toast.credits.refreshFailed') + ': ' + e.message, 'error'); }
   },
@@ -3448,7 +3454,7 @@ <h3 data-i18n="login.title">控制台登录</h3>
         this.toast(I18n.t('toast.credits.allRefreshed', { ok: okCount, fail: failCount }));
         this.loadAccounts();
       } else {
-        this.toast(r.error || I18n.t('toast.credits.refreshFailed'), 'error');
+        this.toast(this.translateError(r.error, 'toast.credits.refreshFailed'), 'error');
       }
     } catch (e) { this.toast(I18n.t('toast.credits.refreshFailed') + ': ' + e.message, 'error'); }
   },
@@ -3463,7 +3469,7 @@ <h3 data-i18n="login.title">控制台登录</h3>
         this.toast(I18n.t('toast.probeAllComplete', { summary }));
         this.loadAccounts();
       } else {
-        this.toast(r.error || I18n.t('error.probeFailed'), 'error');
+        this.toast(this.translateError(r.error, 'error.probeFailed'), 'error');
       }
     } catch (e) { this.toast(I18n.t('error.probeFailed') + ': ' + e.message, 'error'); }
   },
@@ -3477,7 +3483,7 @@ <h3 data-i18n="login.title">控制台登录</h3>
         this.toast(I18n.t('toast.probeComplete', { tier: tierLabel[r.tier] || r.tier }));
         this.loadAccounts();
       } else {
-        this.toast(r.error || I18n.t('error.probeFailed'), 'error');
+        this.toast(this.translateError(r.error, 'error.probeFailed'), 'error');
       }
     } catch (e) { this.toast(I18n.t('error.probeFailed') + ': ' + e.message, 'error'); }
   },
@@ -3603,7 +3609,7 @@ <h3 data-i18n="login.title">控制台登录</h3>
           root.remove();
           self.loadAccounts();
         } else {
-          self.toast(r.error || I18n.t('error.saveFailed'), 'error');
+          self.toast(self.translateError(r.error, 'error.saveFailed'), 'error');
           okBtn.disabled = false; cancelBtn.disabled = false; okBtn.textContent = I18n.t('action.save');
         }
       } catch (e) {
@@ -3638,7 +3644,7 @@ <h3 data-i18n="login.title">控制台登录</h3>
     const body = type === 'api_key' ? { api_key: key, label, proxy } : { token: key, label, proxy };
     const r = await this.api('POST', '/accounts', body);
     if (r.success) { this.toast(I18n.t('account.addSuccess')); document.getElementById('acc-key').value = ''; document.getElementById('acc-label').value = ''; document.getElementById('acc-proxy').value = ''; this.loadAccounts(); }
-    else this.toast(r.error || I18n.t('toast.addFailed'), 'error');
+    else this.toast(this.translateError(r.error, 'toast.addFailed'), 'error');
   },
 
   async discoverLocalWindsurf() {
diff --git a/test/account-add-proxy.test.js b/test/account-add-proxy.test.js
new file mode 100644
index 0000000..319f552
--- /dev/null
+++ b/test/account-add-proxy.test.js
@@ -0,0 +1,107 @@
+import { afterEach, describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { config } from '../src/config.js';
+import { configureBindHost, getAccountList, removeAccount } from '../src/auth.js';
+import { handleDashboardApi } from '../src/dashboard/api.js';
+import { getProxyConfig, removeProxy } from '../src/dashboard/proxy-config.js';
+
+const originalAllowPrivateProxyHosts = config.allowPrivateProxyHosts;
+const createdAccountIds = [];
+const testDeps = {
+  ensureLsForAccount: async () => {},
+  probeAccount: async () => ({}),
+};
+
+function fakeRes() {
+  return {
+    statusCode: 0,
+    body: '',
+    writeHead(status) { this.statusCode = status; },
+    end(chunk) { this.body += chunk ? String(chunk) : ''; },
+    json() { return this.body ? JSON.parse(this.body) : null; },
+  };
+}
+
+function accountPayload(extra = {}) {
+  return {
+    api_key: `test-key-${Date.now()}-${Math.random().toString(16).slice(2, 8)}`,
+    label: 'proxy-test',
+    ...extra,
+  };
+}
+
+afterEach(() => {
+  config.allowPrivateProxyHosts = originalAllowPrivateProxyHosts;
+  configureBindHost('0.0.0.0');
+  while (createdAccountIds.length) {
+    const id = createdAccountIds.pop();
+    removeProxy('account', id);
+    removeAccount(id);
+  }
+});
+
+describe('dashboard account add with proxy validation', () => {
+  it('rejects invalid proxy format before creating an account', async () => {
+    configureBindHost('127.0.0.1');
+    const before = getAccountList().length;
+
+    const res = fakeRes();
+    await handleDashboardApi('POST', '/accounts', accountPayload({ proxy: 'invalid-proxy-url' }), { headers: {} }, res, testDeps);
+
+    assert.equal(res.statusCode, 400);
+    assert.equal(res.json().error, 'ERR_PROXY_FORMAT_INVALID');
+    assert.equal(getAccountList().length, before);
+  });
+
+  it('rejects private proxy hosts by default before creating an account', async () => {
+    configureBindHost('127.0.0.1');
+    config.allowPrivateProxyHosts = false;
+    const before = getAccountList().length;
+
+    const res = fakeRes();
+    await handleDashboardApi('POST', '/accounts', accountPayload({ proxy: 'http://127.0.0.1:8080' }), { headers: {} }, res, testDeps);
+
+    assert.equal(res.statusCode, 400);
+    assert.match(String(res.json().error || ''), /ERR_PROXY_PRIVATE_IP|ERR_PROXY_PRIVATE_HOST/);
+    assert.equal(getAccountList().length, before);
+  });
+
+  it('creates account and binds proxy when proxy is valid', async () => {
+    configureBindHost('127.0.0.1');
+    config.allowPrivateProxyHosts = true;
+    const before = getAccountList().length;
+
+    const res = fakeRes();
+    await handleDashboardApi('POST', '/accounts', accountPayload({ proxy: 'http://127.0.0.1:8080' }), { headers: {} }, res, testDeps);
+
+    assert.equal(res.statusCode, 200);
+    assert.equal(res.json().success, true);
+    const accountId = res.json().account?.id;
+    assert.ok(accountId);
+    createdAccountIds.push(accountId);
+    assert.equal(getAccountList().length, before + 1);
+    assert.deepEqual(getProxyConfig().perAccount[accountId], {
+      type: 'http',
+      host: '127.0.0.1',
+      port: 8080,
+      username: '',
+      password: '',
+    });
+  });
+
+  it('creates account without proxy binding when proxy is omitted', async () => {
+    configureBindHost('127.0.0.1');
+    const before = getAccountList().length;
+
+    const res = fakeRes();
+    await handleDashboardApi('POST', '/accounts', accountPayload(), { headers: {} }, res, testDeps);
+
+    assert.equal(res.statusCode, 200);
+    assert.equal(res.json().success, true);
+    const accountId = res.json().account?.id;
+    assert.ok(accountId);
+    createdAccountIds.push(accountId);
+    assert.equal(getAccountList().length, before + 1);
+    assert.equal(getProxyConfig().perAccount[accountId], undefined);
+  });
+});