# Page Not Found

The URL `admin_manual/security_policy/undefined-2/limit_file_extension` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [업로드 가능한 파일을 확장자로 제한하는 방법](https://help.directcloud.net/admin_manual/upload/limit_file_extension.md)
- [관리자 페이지에 로그인할 수 있는 IP 주소를 제한하는 방법](https://help.directcloud.net/admin_manual/security_policy/admin_ip_restriction.md)
- [공유 링크·업로드 요청에 접근 가능한 IP 주소를 제한하는 방법](https://help.directcloud.net/admin_manual/security_policy/receipt_ip_restriction.md)
- [특정 그룹이나 사용자에게 공유 링크 사용을 허용하지 않도록 설정하는 방법](https://help.directcloud.net/admin_manual/security_policy/link_restriction.md)
- [사용자가 로그인했을 때 알림 메일이 발송 되도록 관리 페이지에서 설정하는 방법](https://help.directcloud.net/admin_manual/security_policy/login_notification.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter, and the optional `goal` parameter:

```
GET https://help.directcloud.net/admin_manual/upload/limit_file_extension.md?ask=<question>&goal=<end_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://help.directcloud.net/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://help.directcloud.net/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/admin_manual/upload/limit_file_extension.md`).

You may also use `Accept: text/markdown` header for content negotiation.