Hello @MilanBortel , Thanks for your reaction. On our DC we use Kaspersky Security Center 12 version 12.2.0.4376. That's right, I installed the Network Agent (12.2.0.4376) and Kaspersky Security for Windows Server (11.0.1.897) on the hosts. It wasn't every server that caused problems either. On some servers IIS used 98/99% cpu usage. As a result, our customers experience slowness . When I removed Kaspersky from the host, the problem was solved. However, I have not created any special tasks that might cause problems. Is this a known issue? I hope you can help me further. Yours sincerely, Stan