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Enable Microsoft Message Queuing (MSMQ) in the Windows Control Panel, as WinCC relies on this for internal communication.

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Which (e.g., S7-1200, S7-1500) are you connecting to? Do you need help setting up the communication drivers ? Enable Microsoft Message Queuing (MSMQ) in the Windows

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After completing the SP2 installation, immediately check the SIOS portal for the latest cumulative Hotfixes (e.g., WinCC V7.4 SP2 Update 4 or higher) to patch known security loopholes and bugs. Conclusion