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Load problem on advant connectivity server after MS Update

Hi, I have installed the latest qualified security updates on a 800xA 5.1 system. The system is redundant only all the redundant servers are updated, the primary server not yet. Now I see a high CPU load on the updated server but only if they have advant connectivity (2 servers). The aspect server and one connectivity server with OPC connection are not effected. Please see attached pictures. CS11 shows a server before update, CS12 shows a server after update. A process WDUHost is consuming the CPU load, but you have a lot of these processes, hard to tell there is comes from.