The server process could not be started because the configured identity is incorrect.

Every morning i perform the action "Check System" on the page System Health in Lab Management.

Every day i get three failed tasks.

On three machines, two Load Generators and the Controller.

On all three the message says: The server process could not be started because the configured identity is incorrect.

Reconfiguring the host will solve the problem, until the next day.

The i have to start all over again.

We are using Pefromance Center 11.50 on Windows 2008 sp2.

Any idea how to solve this?