Article ID: 120023, created on Feb 7, 2014, last review on Dec 5, 2014

  • Applies to:
  • Operations Automation


Office 365 tasks fail and the "Operation is not valid due to the current state of the object" error message appears in the task logs.


On the IIS web server running the Office 365 Gateway Application the maximum number of form keys, files, and JSON members is limited to 1000 in an HTTP request. See for details.


Increase the corresponding limits:

1. Log on to the IIS web server running the Office 365 Gateway Application.
2. Open the settings.config file of the Office 365 Gateway Application in a text editor.
3. Add the following entries to the file after the <appSettings> entry:
    <add key="aspnet:MaxHttpCollectionKeys" value="20000" />
    <add key="aspnet:MaxJsonDeserializerMembers" value="20000" />
4. Save the file.
5. Restart IIS.

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