Check the (located typically at):
If the error persists, the SQL instance may be corrupted. Users often find success by completely uninstalling WinCC and the manual removal of all MS SQL Server components before reinstalling. Community Insights on Fixes
Ensure you have installed the latest Update (e.g., Update 15 or higher).
Does the error occur with (including a newly created blank test project) or just one specific project ? a basic application could not be started wincc 75 best
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After adding your user, you must log off and log back in for changes to take effect. 4. Use the SIMATIC Security Control Tool
| Cause Category | Specific Issue | |----------------|----------------| | | WinCC runtime services lack administrator rights or UAC blocks processes. | | Antivirus / Firewall | Real-time scan blocks RTMessages.exe , PdlRt.exe , or CCEServer.exe . | | License Malfunction | Missing or corrupted license for the basic runtime (e.g., RT 128/512/1024). | | Project Corruption | Damaged .mdf / .ldf database files or inconsistent project configuration. | | SQL Server Issues | SQL Server 2016/2019 instance for WinCC not running or blocked. | | Windows Updates | Recent .NET or VC++ redistributable updates breaking WinCC dependencies. | | Multi-User Conflicts | Another WinCC runtime or demo project already active. | Check the (located typically at): If the error
The error message is one of the most common and disruptive issues faced by automation engineers using Siemens SIMATIC WinCC v7.5 . This error typically occurs when trying to create a new project, open an existing database, or activate the HMI Runtime environment. While the system explicitly highlights a licensing flaw, the actual root cause frequently stems from complex underlying OS compatibility bugs, Windows user group constraints, or corrupted Microsoft SQL Server database instances managed by Siemens software. 📋 Comprehensive Troubleshooting Flowchart Diagnostic Focus Primary Action Expected Outcome 1 Licensing Validation Check Automation License Manager (ALM)
When a WinCC project crashes, it leaves behind temporary lock files that prevent clean subsequent startups. Navigate to your WinCC project directory folder. Delete any files ending with the or .tmp extensions.
Before diving into the solutions, it's essential to understand the potential causes of the error: Does the error occur with (including a newly
Navigate to C:\Program Files (x86)\Siemens\WinCC\bin (or similar path) and run or use CCCleaner.exe -terminate via command line.
WinCC V7.5 basic application could not be started - SiePortal
Ensure and .NET Framework 4.8 Advanced Services are fully checked.
If you want to dive deeper into a specific step, let me know: