Product Announcements and Alerts AppDynamics Support Advisories Current: Support Advisory: The .Net IIS Applications Crash with Windows Patch KB5027123 KB5027219 PDF Download PDF Download page Support Advisory: The .Net IIS Applications Crash with Windows Patch KB5027123 KB5027219. Current page All pages Support Advisory: The .Net IIS Applications Crash with Windows Patch KB5027123 KB5027219 SummaryWhen you apply the Windows patch KB5027123 KB5027219, the .Net IIS applications crash with the following error: .NET Runtime version 2.0.50727.9171 - Fatal Execution Engine Error (7402E5A6) (80131506) CODE Affected SoftwareThis issue occurs mostly in the .Net Agent that uses .Net Framework 2.0 and 3.5 applications.Impact.Net IIS applications crash.ResolutionRefer to the following Microsoft Support articles:KB5028920 - Known Issue with CLR crashing when profilers are in useJune 29, 2023-KB5029009 Update for .NET Framework 3.5 for Windows 10, version 1809 and Windows Server 2019What if I have questions?If you have any questions or concerns, please contact customer support or use our support portal. ×