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Editorial Team
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Asked: 2026-06-06T17:12:28+00:00

When I tried to open my SharePoint extended site, I received error 500. The

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When I tried to open my SharePoint extended site, I received error 500. The error message was:

Cannot read configuration file because it exceeds the maximum file size

My web.config file was just about 260 KB, because it had so many <SafeControl> entries in it. After removing some of the old entries, and getting the file down to 186 KB, my site started to load correctly.

My question:

  • What is the maximum size of web.config?
  • What can be done to avoid such problems in the future?
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1 Answer

  1. Editorial Team

    Its not hard coded its defined in 

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\InetStp\Configuration\MaxWebConfigFileSizeInKB

    or on 64 Bit machines 

    HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\InetStp\Configuration\MaxWebConfigFileSizeInKB

    The “cutoff point” by default, unless you configure the MaxWebConfigFileSizeInKB appears to be 250Kb

    Remember you can always split your web.config files into multiple little files to get around this issue,

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