Running Lab Management with XP SP3 Machines

LabManagement
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If you’re running Lab Management with lab machines with XP SP3, you may run into a problem where the Test Agent is never ready for running tests.

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The environment was starting up fine and configuring both network isolation as well as the workflow agent. However, the Test Capability was continually not ready – the event logs had a message like this:

Unable to connect to the controller on 'TFSMachine.Domain:6901'. The agent can connect to the controller but the controller cannot connect to the agent because of following reason: An error occurred while processing the request on the server: System.IO.IOException: The write operation failed, see inner exception. ---> System.ComponentModel.Win32Exception: The message or signature supplied for verification has been altered.

Scratching around led me to this rather helpful blog site: Troubleshooting Guide for Visual Studio Test Controller and Agent. The problem is mentioned there – it’s a problem with a Windows hotfix (KB968389) which you simply need to uninstall from the XP Lab machine. Reboot and you’re good to go.

Happy Labbing!