App Control: Server Service Fails to Start after Windows Update

Products

• Carbon Black App Control (formerly Cb Protection)

Issue/Introduction

• App Control Server Service is crashing on start
• Running service manually shows an error detailing the file MFC140u.dll is missing

Environment

• App Control Server: All Supported Versions
• Microsoft Windows Server 2019
• Windows .NET Framework Update

Cause

This is caused by a C++ Redistributable failing an install or upgrade, leading to missing DLLs

Resolution

1. Download and Install the most recent copies of the Visual C++ Redistributables from Microsoft
2. Reboot the server