Sign in with Microsoft
Sign in or create an account.
Hello,
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.

Symptoms

Some functions don't work on customized SharePoint pages that use the SPWorkflowDataSource or FabricWorkflowInstanceProvider user control, and you see entries for the 9zu4p or 9zu4q event tag in SharePoint Unified Logging System (ULS) logs. This problem occurs after you install the following February 9, 2021, SharePoint security updates:

Cause

The security rule is enhanced when you convert types in SPWorkflowDataSource and FabricWorkflowInstanceProvider. Only trusted types can be converted.

Resolution

To restore the inoperative functions, add the blocked types as trusted types in the Web.config file if the blocked types are safe.

To do this, add a new AllowConvertType element that has a type attribute to the Web.config file under the configuration/SharePoint/SafeMode/AllowConvertTypes element, as follows:

<SafeMode MaxControls="200" CallStack="false" DirectFileDependencies="15" TotalFileDependencies="250" AllowPageLevelTrace="false">
<AllowConvertTypes>
<AllowConvertType type="<allowedConvertTypeName>, <allowedConvertTypeAssemblyName>, <AssemblyVersion>, <AssemblyLanguageSetting>, <AssemblyPublicKey>"/>
</AllowConvertTypes>
</SafeMode>

Need more help?

Expand your skills

EXPLORE TRAINING >

Get new features first

JOIN MICROSOFT 365 INSIDERS >

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×