After you install one of the following SharePoint Server updates, Microsoft Identity Manager (MIM) portal pages aren't displayed:
See Ghosted pages in SharePoint don't render for more information.
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.
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">
<PageParserPath VirtualPath="/identitymanagement/*" CompilationMode="Always" AllowServerSideScript="true" IncludeSubFolders="True"/>
Learn about the terminology that Microsoft uses to describe software updates.