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Support Article

Modal dialogs are sized incorrectly in IE11



Modal dialogs do not render correctly in IE11 using SSO, but do render correctly in Chrome and Firefox. In IE, the modal displays at the wrong size, and must be manually adjusted to make all fields and buttons visible.

Error Messages

Not applicable

Steps to Reproduce

1. In IE11, log into Pega using basic authentication.
2. Open any modal dialog.
3. In IE11, log out and log back in via SSO.
4. Open the same modal dialog.

Root Cause

The middleware used to provide SSO in the environment is causing the browser to render in Compatibility Mode, which is deprecated in Pega 7.


Consult with middleware to correct the settings so that IE provides the correct User-Agent string for IE11: Mozilla/5.0, which can be observed in any network trace.

To confirm the issue, use a network trace tool like Fiddler to view the User Agent.

IE in supported Edge mode will show the following User Agent string:
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko

Unsupported compatibility modes will show lower versions in the User-Agent string of the request header, like:
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)

Once the issue is confirmed, check the middleware provider to determine any settings which alter the User-Agent string sent to Pega that force the unsupported Compatibility mode.

Published August 26, 2017 - Updated October 8, 2020

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