> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/storage/appsec-azure-97.md).

# Virtual machine scale sets do not have encryption at host enabled misconfiguration detected in code

## Rule Details

|                        |                                       |
| ---------------------- | ------------------------------------- |
| Cortex AppSec Rule ID  | APPSEC\_AZURE\_97                     |
| Category - Subcategory | Storage - Encryption                  |
| Provider               | AZURE                                 |
| Severity               | LOW                                   |
| Framework              | ARM, Bicep, Terraform, Terraform Plan |

## Impact

Use encryption at host to get end-to-end encryption for your virtual machine and virtual machine scale set data. Encryption at host enables encryption at rest for your temporary disk and OS/data disk caches. Temporary and ephemeral OS disks are encrypted with platform-managed keys when encryption at host is enabled. OS/data disk caches are encrypted at rest with either customer-managed or platform-managed key, depending on the encryption type selected on the disk.

## How to Fix

*Resource:* azurerm\_windows\_virtual\_machine\_scale\_set

* *Arguments:* encryption\_at\_host\_enabled \[source,go]

***

resource "azurerm\_windows\_virtual\_machine\_scale\_set" "example" { ...

* encryption\_at\_host\_enabled = true ... }

***


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/storage/appsec-azure-97.md?ask=<question>&goal=<endgoal>
```

`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.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.