Microsoft KB Archive/840419

= Xbox: The Diagnostic Server detects Maximum Transmission Unit (MTU) problems when using Xbox Live =

Article ID: 840419

Article Last Modified on 4/25/2007

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APPLIES TO


 * Microsoft Xbox Live
 * Microsoft Xbox

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SUMMARY
This article describes how to diagnose Maximum Transmission Unit (MTU) problems.



MORE INFORMATION
With the most recent release of the Dashboard, Xbox Live users can analyze router problems on a more detailed level than they could in previous releases. Through the Dashboard’s Connect Status screen (Network Troubleshooter), you can access a new tool named the Diagnostic Server. The Diagnostic Server performs various tests to determine whether your router:
 * Has an MTU setting that is incompatible with Xbox Live.
 * Handles ICMP port-unreachable packets incorrectly.
 * Is a highly aggressive NAT-type router.

How the MTU setting can prevent you from connecting to Xbox Live
Your router’s MTU (Maximum Transmission Unit) setting must be higher than 1365. If it is not, you cannot connect to Xbox Live.

How to determine if your connection problem is an MTU router problem
To verify whether your router’s MTU setting meets the minimum requirement for Xbox Live:  Select the Y button on the Connect Status screen, and then press the A button to continue to the diagnostic read-outs. You receive the following information in the Diagnostic Server window:



MT: x (aaaa – bbbb) x=0  MTU test failed and there is an MTU problem.

x=1  No MTU problem.

(aaaa-bbbb) is the error code

 If the MT shows a “1,” the router passed the test, and the MTU setting is not an issue for your router.

If the MT shows a “0,” the test failed. If this is the case, you have a router that is not compatible with Xbox Live. You may have to manually change your router’s MTU setting, update its firmware, or obtain one of the routers listed on one of the following Xbox Router Compatibility Web sites:

United States: http://www.xbox.com/en-us/live/connect/routercompatibility.htm

Note For Pacific Rim countries, the Router compatibility page is different for each country:

Australia: http://www.xbox.com/en-AU/support/xbox/live/faq/routers.htm

Hong Kong: http://www.xbox.com/zh-hk/live/connect/routercompatibility.htm

Korea: http://www.xbox.com/ko-kr/live/connect/routercompatibility.htm

New Zealand: http://www.xbox.com/en-NZ/support/xbox/live/faq/routers.htm

Singapore: http://www.xbox.com/zh-sg/live/connect/routercompatibility.htm

Taiwan: http://www.xbox.com/zh-tw/live/connect/routercompatibility.htm

Note For European countries, all compatible routers are exactly the same:

Europe: http://www.xbox.com/zh-SG/live/connect/router.htm

Note If you are not using a router to connect to Xbox Live, the Diagnostic Server readings should all show a positive (pass) test result (1).

Error Codes Associated with MTU tests
The following table gives the error codes associated with MTU tests that pass or fail. The Success code is displayed for each successful test. Failures may be caused by DNS failures, memory shortages, or diagnostic server problems.

Note If you are not using a router to connect to Xbox Live, the Diagnostic Server readings should all indicate a positive (pass) test result (1).

Diagnostic Servers
For additional information about Diagnostic Servers, visit one the following Web sites:

United States

http://www.xbox.com/en-US/support/connecttolive/xbox/connectionmethods/diagnosingconnections.htm

Pacific Rim

Australia: http://www.xbox.com/en-AU/support/xbox/live/start/connect/diagnose-dash/default.htm

Hong Kong: http://www.xbox.com/zh-HK/live/connect

Korea: http://www.xbox.com/ko-kr/Live/Connect/diagnosing.htm

New Zealand: http://www.xbox.com/en-NZ/support/xbox/live/start/connect/diagnose-dash/default.htm

Singapore: http://www.xbox.com/zh-sg/Live/Connect/diagnosing.htm

Taiwan: http://www.xbox.com/zh-tw/Live/Connect/diagnosing.htm

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