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Support Article

IE11 displays error due to compatibility settings



Error displays and unable to access the system using the Internet Explorer 11 browser. This occurs when accessing the application the first time.

Error Messages

Pega does not support compatibility mode

Steps to Reproduce

Launch the application in Internet  Explorer 11 browser with Compatibility settings enabled.

Root Cause

A defect or configuration issue in the operating environment: Compatibility settings.


Perform either of the following local-changes to overcome the default Compatibility settings:
  • Update the Individual Harness rules to select ‘IE Documentation Mode’= Other (present in the Advanced tab of the harness where the value is either IE= edge or IE=emaluateIE11 as per the requirement).
  • Save As the pyMetaTags HTML fragment rule and include IE Documentation Mode’= Other.

Published January 5, 2019 - Updated December 2, 2021

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