Microsoft KB Archive/812509

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

Article ID: 812509

Article Last Modified on 10/17/2007

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APPLIES TO


 * Microsoft DirectX 9.0

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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://msdn2.microsoft.com/en-us/directx/aa937788.aspx

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.

Additional query words: upnp

Keywords: kbprb KB812509

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