Symptoms
After you install one of the following SharePoint Server updates, Microsoft Identity Manager (MIM) portal pages aren't displayed:
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Description of the security update for SharePoint Server 2019: September 8, 2020 (KB 4484505)
-
September 21, 2020, update for SharePoint Server 2019 (KB 4461512)
-
Description of the security update for SharePoint Foundation 2013: September 8, 2020 (KB 4484525)
-
Description of the security update for SharePoint Foundation 2010: September 8, 2020 (KB 4486667)
See Ghosted pages in SharePoint don't render for more information.
Cause
The security level of SharePoint ghosted pages was enhanced by forbidding server-side scripts and unsafe controls. Because MIM portal uses server-side scripts, its pages are blocked from rendering.
Workaround
To work around this issue until the next MIM hotfix is released, add a new PageParserPath element that has a VirtualPath attribute to the Web.config file under the configuration/SharePoint/SafeMode/PageParserPaths element, as follows:
<SafeMode MaxControls="200" CallStack="false" DirectFileDependencies="10" TotalFileDependencies="250" AllowPageLevelTrace="false">
<PageParserPaths>
<PageParserPath VirtualPath="/identitymanagement/*" CompilationMode="Always" AllowServerSideScript="true" IncludeSubFolders="True"/>
</PageParserPaths>
</SafeMode>
References
Microsoft Identity Manager release history
Learn about the terminology that Microsoft uses to describe software updates.
