---
title: Web Application Suspicious Activity: No User Agent
description: A request to a web application server contained no identifying user agent string. Rule type: query Rule indices: apm--transaction, traces-apm*. Rule Severity:...
url: https://www.elastic.co/elastic/docs-builder/docs/3167/reference/security/prebuilt-rules/rules/_deprecated/apm_null_user_agent
products:
  - Elastic Security
---

# Web Application Suspicious Activity: No User Agent
<warning>
  This rule has been deprecated as of 2022/09/13.
</warning>

A request to a web application server contained no identifying user agent string.
**Rule type**: query
**Rule indices**:
- apm-*-transaction*
- traces-apm*

**Rule Severity**: medium
**Risk Score**: 47
**Runs every**: 
**Searches indices from**: ``
**Maximum alerts per execution**: 100
**References**:
- [[https://en.wikipedia.org/wiki/User_agent](https://en.wikipedia.org/wiki/User_agent)](https://en.wikipedia.org/wiki/User_agent)

**Tags**:
- Elastic
- APM

**Version**: 101
**Rule authors**:
- Elastic

**Rule license**: Elastic License v2

## Rule Query

```kuery
url.path:*
```