> For the complete documentation index, see [llms.txt](https://docs.ndi.video/all/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ndi.video/all/faq/common-issues/traffic-drops-after-windows-update.md).

# Traffic Drops After Windows Update

{% hint style="info" %}
Windows has a released a patch for the unexpected drop in traffic on RUDP connections. The patch is currently available for both Windows 10 and 11. You can find more information on the [Windows Support Page](https://support.microsoft.com/en-us/topic/september-9-2025-kb5065429-os-builds-19044-6332-and-19045-6332-b343e907-4f50-41d9-80f8-519490551b91)
{% endhint %}

There is currently a Windows Security Update that can cause NDI traffic to drop unexpectedly on computers with this update installed.

The affected updates are:

**Windows 11 – KB5063878**\
<https://support.microsoft.com/en-au/topic/august-12-2025-kb5063878-os-build-26100-4946-e4b87262-75c8-4fef-9df7-4a18099ee294>

**Windows 10 – KB5063709**\
<https://support.microsoft.com/en-au/topic/august-12-2025-kb5063709-os-builds-19044-6216-and-19045-6216-96d99cf6-f8b5-4798-9892-4e3eb8f11548>

### Symptoms

When this update is installed, NDI connections may drop unexpectedly during use. The problem occurs **only with RUDP** connections, while traffic sent or received using **UDP or Single-TCP remains unaffected**.

#### Check if you have the affected update installed

1. Open **Settings** in Windows.
2. Select **Windows Update**.
3. Select **Update History**.
4. Select **Uninstall Updates**.
5. Look for **Security Update for Microsoft Windows (KB5063878 or KB5063709)**.

If you don’t have it installed, we recommend delaying installation until a fix is released. However, depending on your update settings, it may install automatically in the future.

### How to solve

**Option 1 (recommended):**\
Manually change the NDI Receive Mode to use TCP or UDP instead of RUDP.

1. Download and install the free [NDI Tools pack](https://ndi.video/tools/).
2. Launch the **NDI Access Manager** app.
3. Go to the **Advanced** tab.
4. Change **Receive Mode** to **Single TCP** or **UDP**, then press OK.
5. Repeat on any other affected computers.

**Option 2:**\
Uninstall the Windows Security Update.

1. Open **Settings** in Windows.
2. Select **Windows Update**.
3. Select **Update History**.
4. Select **Uninstall Updates**.
5. Find **Security Update for Microsoft Windows (KB5063878 or KB5063709)** and click **Uninstall**.

{% hint style="info" %}
Windows may reinstall the update at a later date, so Option 1 is generally preferred unless you rely on workflows that specifically require RUDP.
{% endhint %}


---

# 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 by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.ndi.video/all/faq/common-issues/traffic-drops-after-windows-update.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

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.