> For the complete documentation index, see [llms.txt](https://docs.devolutions.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.devolutions.net/server/de/knowledge-base/troubleshooting-articles/the-remote-server-returned-an-error-400-bad-request.md).

# The remote server returned an error (400) Bad Request

Sie erhalten den folgenden Fehlermeldungsdialog, wenn Sie versuchen, sich mit Remote Desktop Manager an der Devolutions Server-Instanz zu authentifizieren.

```
The remote server returned an error (400) Bad Request
```

### Lösung

Es gibt zwei verschiedene Lösungen für dieses Problem:

* Reduzieren Sie die Anzahl der AD-Gruppen, in denen das Benutzerkonto Mitglied ist. Wir sind uns bewusst, dass es aufgrund des Aufbaus der AD-Struktur meistens nicht möglich ist, die Anzahl der AD-Gruppen zu reduzieren.
* Erhöhen Sie die Einstellungen für die Registrierungseinträge ***MaxFieldLength*** und ***MaxRequestBytes*** auf dem Server. Weitere Informationen dazu, wie Sie diese Werte erhöhen können, finden Sie im folgenden Microsoft-Artikel. <https://support.microsoft.com/en-us/help/2020943/http-400-bad-request-request-header-too-long-response-to-http-request>


---

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