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Dear Jaap, As Siemens Self Support integrated with SiePortal, I understand you're experiencing issues with SFC visualization in PCS7 V8.1SP1 after commissioning started, while other MultiClient functions remain operational on a redundant server setup. This often points to network communication disruptions specifically affecting SFC data transfer. **Here's what to investigate:** 1. **Network Connectivity:** Verify network stability between the client, servers, and the SFC runtime environment. Check for packet loss or intermittent connection issues. 2. **Firewall/Security:** Ensure firewalls aren't blocking SFC-related communication ports. 3. **Server Synchronization:** Confirm both servers in the redundant pair are fully synchronized, particularly regarding SFC configuration. 4. **OPC DA/AE:** Check the status of OPC DA/AE communication as SFC relies on it. **SiePortal Resources:** Search SiePortal using keywords like "PCS7 SFC visualization issues," "MultiClient communication errors," and "redundancy problems" for known solutions and FAQs. ( [https://support.industry.siemens.com/](https://support.industry.siemens.com/)) If the problem persists, gather detailed error messages and network logs for a more targeted analysis.