> 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/it/knowledge-base/troubleshooting-articles/the-remote-server-returned-an-error-400-bad-request.md).

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

Viene visualizzata la seguente finestra di dialogo con un messaggio di errore quando si tenta di autenticarsi sull'istanza di Devolutions Server con Remote Desktop Manager.

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

### Soluzione

Esistono due soluzioni diverse per questo problema:

* Ridurre il numero di gruppi AD di cui fa parte l'account utente. Siamo consapevoli che, nella maggior parte dei casi, a causa della progettazione della struttura AD, non è possibile ridurre il numero di gruppi AD.
* Aumentare le impostazioni delle voci di registro ***MaxFieldLength*** e ***MaxRequestBytes*** sul server. Consulti il seguente articolo Microsoft per maggiori informazioni su come aumentare questi valori. <https://support.microsoft.com/en-us/help/2020943/http-400-bad-request-request-header-too-long-response-to-http-request>


---

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