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We have admin-approved InfoPath 2010 form with code deployed on Sharepoint 2010. The form has a few REST data connections which execute on form load. One user keeps getting this error when opening form:

XML data that is required for this form to function correctly cannot be found. An entry has been added to the Windows event log of the server. Log ID:5566

Correlation ID gives these errors in Sharepoint log:

Data adapter failed during OnLoad: The form cannot run the specified query. The following query failed: REST ... Type: DataAdapterException, Exception Message: The form cannot run the specified query. The remote server returned an error: (500) Internal Server Error.

When the user tries to open the same form after a few seconds everything works as expected. I couldn't reproduce the issue. Does anyone have any clue what could be the reason for this? Thank you.

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This seemed to resolve the issue:

$f = Get-SPInfoPathFormsService 
$f.Properties.Add("AllowEventPropagation", $false) 
$f.Update() 

Reference link: https://support.microsoft.com/en-us/help/2984138/forms-timeout-or-take-a-long-time-to-open-in-infopath-2010-or-infopath

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