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How to tell what MTU is being used in Windows XP

Fresh5 days ago
Mar 15, 2026176605 views
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Problem

I'm suffering from a really weird problem where I randomly get "The connection to the server was reset" errors when trying to access web pages (HTTP error 12031 according to the Windows network diagnostic tool) - this happens regardless of whether the web page I'm trying to access is on the externa…

Error Output

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{AdapterID}\MTU

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Fix for: How to tell what MTU is being used in Windows XP

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For Windows 7, Windows Vista and Windows XP, the MTU for various interfaces is available from Windows itself using . Windows 7, Windows Vista To show current MTU on Windows 7 or Windows Vista, from a command prompt: And for IPv4 interfaces: Note: In…

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Environment