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Update IIS 404.13 CONTENT_LENGTH_TOO_LARGE troubleshooting guidance #2045

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Update IIS 404.13 CONTENT_LENGTH_TOO_LARGE troubleshooting guidance #2045

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32 changes: 25 additions & 7 deletions support/developer/webapps/iis/site-behavior-performance/http-404-13-website.md
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Expand Up @@ -5,16 +5,16 @@ ms.date: 04/17/2020
ms.custom: sap:Site Behavior and Performance\Runtime errors and exceptions, including HTTP 400 and 50x errors
ms.reviewer: mlaing
---
# HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE when you visit a web site that is hosted on a server that is running IIS 7.0
# HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE when you visit a web site that is hosted on a server that is running IIS 10.0 and later versions

This article helps you resolve the error (HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE) that occurs when you visit a website in Internet Information Services (IIS).

_Original product version:_   Internet Information Services 7.0
_Original product version:_   Internet Information Services 10.0 and later versions
_Original KB number:_   942074

## Symptoms

Consider the following scenario. You have a web site that is hosted on a server that is running IIS 7.0. When a user visits this web site, the user receives an error message that resembles the following error message:
Consider the following scenario. You have a web site that is hosted on a server that is running IIS 10.0 and later versions. When a user visits this web site, the user receives an error message that resembles the following error message:

> Server Error in Application "**application name**"
> HTTP Error 404.13 - CONTENT_LENGTH_TOO_LARGE
Expand All @@ -23,11 +23,29 @@ Consider the following scenario. You have a web site that is hosted on a server

## Cause

This problem occurs because the client request contains a `Content-Length` header that is larger than the value that is specified for this header in the `maxAllowedContentLength` property in the *ApplicationHost.config* file.
This problem occurs because the client request contains a `Content-Length` header that is larger than the value (in bytes) that is specified for the `maxAllowedContentLength` attribute in the *ApplicationHost.config* file or the site-level *web.config* file.

## Resolution

To resolve this problem, follow these steps:
To resolve this problem, use one of the following methods.

### Method 1: Update the site-level web.config file (recommended)

Add or update the `maxAllowedContentLength` attribute in your site's *web.config* file. Set the value (in bytes) to match or exceed the size of the `Content-Length` header that the client sends. By default, the value of `maxAllowedContentLength` is 30000000 bytes (approximately 28.6 MB).

For example, to allow up to 50 MB, add the following inside the `<system.webServer>` section of your *web.config* file:

```xml
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="52428800" />
</requestFiltering>
</security>
</system.webServer>
```

### Method 2: Edit the ApplicationHost.config file (server-wide)

1. Select **Start**. In the **Start Search** box, type *Notepad*. Right-click **Notepad**, and then select **Run as administrator**.

Expand All @@ -37,9 +55,9 @@ To resolve this problem, follow these steps:
2. On the **File** menu, select **Open**. In the **File name** box, type `%windir%\system32\inetsrv\config\applicationhost.config`, and then select **Open**.

3. In the *ApplicationHost.config* file, locate the `<requestLimits>` node.
4. Remove the `maxAllowedContentLength` property. Or, add a value that matches the size of the `Content-Length` header that the client sends as part of the request. By default, the value of the `maxAllowedContentLength` property is 30000000.
4. Set the `maxAllowedContentLength` attribute to a value (in bytes) that matches or exceeds the size of the `Content-Length` header that the client sends as part of the request. By default, the value of `maxAllowedContentLength` is 30000000 bytes (approximately 28.6 MB). Alternatively, remove the attribute to revert to the default value.

For example, modify the following configuration data inside the `<requestFiltering>`section.
For example, modify the following configuration data inside the `<requestFiltering>` section:

```xml
<requestLimits maxAllowedContentLength ="<length>" />
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