diff --git a/PROJECT_MEMORY.md b/PROJECT_MEMORY.md
index 1f97a3e..95e72b2 100644
--- a/PROJECT_MEMORY.md
+++ b/PROJECT_MEMORY.md
@@ -58,6 +58,7 @@ npm audit --omit=dev
 
 ## Offene nächste Schritte
 
+- DoodStream: Der echte OTP-Test nach dem ersten Kompatibilitätsfix meldete weiterhin fehlendes `sess_id`. JSON- und HTTP-Weiterleitungen werden nun vor der Sessionprüfung aufgerufen, einschließlich der dort gesetzten Cookies. 35 gezielte Tests und Lint sind erfolgreich; ein erneuter echter OTP-Login steht aus. Die konkrete Ursache der Nutzersitzung ist noch nicht abschließend bestätigt. Fehlende Sessions liefern HTTP-Status, Gastseiten-/Sessionfeld-Erkennung und Cookie-Anzahl ohne Cookie-Werte oder Zugangsdaten.
 - Keine offenen Schritte für Release `v2.1.44`; Rollback-Ziel ist Anwendungsversion `2.1.43`.
 - Bei Bedarf einen Arbeitsweg ohne `&` im absoluten Pfad verwenden oder die npm-Aufrufe weiterhin direkt ausführen.
 
diff --git a/lib/doodstream-upload.js b/lib/doodstream-upload.js
index 4798bb9..2d7b73f 100644
--- a/lib/doodstream-upload.js
+++ b/lib/doodstream-upload.js
@@ -72,6 +72,9 @@ class DoodstreamUploader {
   }
 
   async _fetch(url, opts = {}, _redirectCount = 0) {
+    if (opts.allowedOrigin && new URL(url).origin !== opts.allowedOrigin) {
+      throw new Error('Doodstream Login: Unerwartetes Weiterleitungsziel');
+    }
     const MAX_REDIRECTS = 10;
     const headers = {
       'User-Agent': USER_AGENT,
@@ -98,7 +101,7 @@ class DoodstreamUploader {
       } catch (err) {
         if (opts.signal && opts.signal.aborted) throw err; // caller abort: don't retry
         if (attempt >= 3) throw err;
-        _debugLog(`_fetch transient (${attempt}/3) ${url}: ${err && err.message}; retry`);
+        _debugLog(`_fetch transient (${attempt}/3) ${new URL(url).origin}: retry`);
         await new Promise(r => setTimeout(r, 400 * attempt));
       }
     }
@@ -147,22 +150,24 @@ class DoodstreamUploader {
     const res = await fetch(`${BASE_URL}/?op=login_ajax&${loginData.toString()}`, {
       method: 'GET',
       headers,
-      redirect: 'manual'
+      redirect: 'manual',
+      signal: AbortSignal.timeout(20000)
     });
 
     this._parseCookiesFromHeaders(res.headers);
+    let loginRedirect = '';
 
     // On successful login, server may redirect (3xx) to dashboard
     if ([301, 302, 303, 307, 308].includes(res.status)) {
       try { await res.text(); } catch {}
-      // Redirect means login succeeded
+      loginRedirect = res.headers.get('location') || '';
     } else {
       const body = await res.text();
       let json;
       try { json = JSON.parse(body); } catch { json = null; }
 
       if (json && ['success', 'redirect'].includes(json.status)) {
-        // Explicit success response
+        if (json.status === 'redirect') loginRedirect = json.message || '';
       } else if (json && (json.status === 'otp_sent' || (json.message && /otp|verification code/i.test(json.message)))) {
         // OTP required — signal caller to collect OTP from user
         const err = new Error(`Doodstream Login: ${json.message || 'OTP erforderlich'}`);
@@ -178,7 +183,20 @@ class DoodstreamUploader {
       }
     }
 
-    // Extract sess_id from the upload page
+    if (loginRedirect) {
+      const target = new URL(loginRedirect, BASE_URL);
+      if (target.origin !== BASE_URL || target.username || target.password) {
+        throw new Error('Doodstream Login: Unerwartetes Weiterleitungsziel');
+      }
+      const landing = await this._fetch(target.href, { allowedOrigin: BASE_URL });
+      const landingHtml = await landing.text();
+      const sessId = this._findSessId(landingHtml);
+      if (landing.status === 200 && sessId) {
+        this.sessId = sessId;
+        return;
+      }
+    }
+
     await this._extractSessId();
   }
 
@@ -186,13 +204,13 @@ class DoodstreamUploader {
     const res = await this._fetch(BASE_URL + '/?op=upload');
     const html = await res.text();
     const sessId = this._findSessId(html);
-
-    if (sessId) {
+    if (res.status === 200 && sessId) {
       this.sessId = sessId;
       return;
     }
-
-    throw new Error('Doodstream: sess_id nicht gefunden nach Login');
+    this.sessId = '';
+    const guest = /utype\s*:\s*['"]anon['"]/.test(html);
+    throw new Error(`Doodstream: sess_id nicht gefunden nach Login (HTTP ${res.status}; guest=${guest}; sessionField=${/sess_id/.test(html)}; cookies=${this.cookies.size})`);
   }
 
   _findSessId(html) {
diff --git a/tests/doodstream-upload.test.js b/tests/doodstream-upload.test.js
index 7f9d9b9..33a4ba9 100644
--- a/tests/doodstream-upload.test.js
+++ b/tests/doodstream-upload.test.js
@@ -215,6 +215,52 @@ test('_findSessId accepts the current Vue upload data and URL-safe tokens', () =
   assert.equal(up._findSessId(`<home-upload :upload="{ utype: 'anon', sess_id: '' }"></home-upload>`), '');
 });
 
+test('login follows the session-establishing redirect before loading the upload page', async (t) => {
+  const up = new DoodstreamUploader();
+  const requests = [];
+  t.mock.method(globalThis, 'fetch', async (url, options) => {
+    const parsed = new URL(url);
+    const route = parsed.pathname + (parsed.searchParams.get('op') || '');
+    requests.push(route);
+    if (parsed.searchParams.get('op') === 'login_ajax') {
+      return new Response(JSON.stringify({ status: 'redirect', message: '/finish-login?ticket=TEST' }));
+    }
+    if (parsed.pathname === '/finish-login') {
+      return new Response('', { headers: { 'set-cookie': 'session=TEST; Path=/' } });
+    }
+    if (parsed.searchParams.get('op') === 'upload') {
+      assert.equal(options.headers.Cookie, 'session=TEST');
+      return new Response('<input name="sess_id" value="TEST_SESSION">');
+    }
+    return new Response('');
+  });
+  await up.login('user', 'password', '123456');
+  assert.deepEqual(requests, ['/', '/login_ajax', '/finish-login', '/upload']);
+  assert.equal(up.sessId, 'TEST_SESSION');
+});
+
+test('login cannot report success when the redirected session is still a guest', async (t) => {
+  const up = new DoodstreamUploader();
+  t.mock.method(globalThis, 'fetch', async url => new Response(
+    new URL(url).searchParams.get('op') === 'login_ajax'
+      ? JSON.stringify({ status: 'redirect', message: '/dashboard' })
+      : `<home-upload :upload="{ utype: 'anon', sess_id: '' }"></home-upload>`
+  ));
+  await assert.rejects(up.login('user', 'password'), /guest=true; sessionField=true; cookies=0/);
+  assert.equal(up.sessId, '');
+});
+
+test('login redirect chains cannot forward session cookies to another origin', async (t) => {
+  const up = new DoodstreamUploader();
+  let calls = 0;
+  t.mock.method(globalThis, 'fetch', async () => {
+    calls++;
+    return new Response('', { status: 302, headers: { location: 'https://other.example/' } });
+  });
+  await assert.rejects(up._fetch('https://doodstream.com/dashboard', { allowedOrigin: 'https://doodstream.com' }), /Weiterleitungsziel/);
+  assert.equal(calls, 1);
+});
+
 test('getUploadServer: parses the current upload_get_srv response', async () => {
   const up = new DoodstreamUploader();
   up._fetch = async (url) => {