SharePoint Workflow failed to start suddenly

In one of our SharePoint Farms we recognized, that suddenly some SharePoint Workflows shows a message “Failed to start”. We tried to manually restart them, but the error comes again. After investigation of error logs and workflows in SharePoint Designer we realized that only some of the workflows didn’t work. Those who uses conditions and special tasks belonged to the workflows not working anymore.

One of the error messages was:

“System.CodeDom.CodeBinaryOperatorExpression is not marked as authorized in the application configuration file”

So we tried to republish the workflow. But SharePoint Designer throwed an similiar message, that activities or conditions could not be found. But only at workflows which didn’t run. We could republish working workflows.

After some more research, we found a really good article, which helped in this situation:

“After installing .NET security patches to address CVE-2018-8421, SharePoint workflows stop working (KB 4457916/4457035 and others)”

So the reason was an security patch. After adding the entries into the web.config of SharePoint the Workflows worked again.

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Karsten Schneider
About Karsten Schneider 287 Articles
He is Consultant for SharePoint Solutions for collaboration, communication and business processes. He provides his customers applications based on standard features as well as development or combining the power of several microsoft tools like Dynamics CRM. In his free time he tries to collect tipps and worthy experience in this blog.

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