DirectX 9: Multiplayer Games, MSN Messenger Do Not Work After You Upgrade to DirectX 9.0 (812509)

The information in this article applies to:

Microsoft DirectX 9.0 Runtime

SYMPTOMS

After you upgrade to DirectX 9.0, some multiplayer games or MSN Messenger may not work correctly. For example, MSN Messenger may not start, or your multiplayer game may not work when you try to make an online connection.

CAUSE

This issue may occur if you use a router that does not properly implement Universal Plug and Play. DirectX 9.0 implements support for Universal Plug and Play. Universal Plug and Play is a function that automatically opens and closes a router's ports.

RESOLUTION

To resolve this issue, use the following methods in the order that they appear:

Method 1: Install Microsoft DirectX 9.0a (or Later)

Visit the following Microsoft Web site to download and install the latest version of DirectX:

http://www.microsoft.com/windows/directx/downloads

Method 2: Upgrade Your Router's Firmware

For information about how to upgrade your router's firmware, view the documentation that was included with your router.

Modification Type:	Minor	Last Reviewed:	1/10/2006
Keywords:	kbprb KB812509 kbAudEndUser