---
title: "Handle Microsoft End-of-Life for RC4"
slug: "handle-microsoft-end-of-life-for-rc4"
updated: 2026-07-29T10:23:28Z
published: 2026-07-29T10:23:28Z
canonical: "kb.ctera.com/handle-microsoft-end-of-life-for-rc4"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.ctera.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Handle Microsoft End-of-Life for RC4

Microsoft announced the end-of-life for RC4 support: [https://techcommunity.microsoft.com/blog/coreinfrastructureandsecurityblog/what-changed-in-rc4-with-the-january-2026-windows-update-and-why-it-is-important/4504732](https://techcommunity.microsoft.com/blog/coreinfrastructureandsecurityblog/what-changed-in-rc4-with-the-january-2026-windows-update-and-why-it-is-important/4504732).

All edge filers before version 7.11.5100.30 use RC4 for **Kerberos authentication** and it **must** be disabled.

**To disable RC4:**

1. As an edge filer administrator, [access the edge filer CLI interface](/v1/docs/how-to-6).
2. Run the following CLI: `set /config/fileservices/cifs/AESEncryptionKerberos true`

RC4 is no longer used in CTERA Edge Filers from version 7.11.5100.30.