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20 lines
933 B
Markdown
20 lines
933 B
Markdown
---
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title: microsoft.com not working
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layout: default
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created: 2009-03-18 20:05:52 +0100
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updated: 2009-03-18 20:05:52 +0100
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toc: false
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tags:
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- know-how
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- software
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- windows
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---
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If you have a router and Internet works with any application/site but you can't connect to any `microsoft.com` site
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(e.g. *WindowsUpdate*, *Windows Live Messenger* [error code: 81000306], etc.) you might have your MTU set to a too high
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value. The default MTU for ethernet devices is **1500** but since the PPPoE header adds 8 Bytes to the packets, they
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get fragmented. And the `microsoft.com` servers seem to not accept fragmented packets.
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So the solution is to set your MTU to the best value for PPPoE: **1492**. To do this, use a tool like the [TCP Optimizer](http://www.speedguide.net/downloads.php)
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to set the MTU for your ethernet device to 1492. After a reboot, all `microsoft.com` pages should work again -
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including *Windows Live Messenger*.
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