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: If all else fails, the most reliable "last resort" is a fresh installation of the operating system followed by WinCC 7.5.
: WinCC relies on a specific SQL instance. Ensure the ...\WINCC instance exists and is running in the SQL Server Management Studio . If the SQL server was installed incorrectly or the computer name contains special characters (like underscores), WinCC may fail to start. Advanced Fixes a basic application could not be started wincc 75 best
The error in WinCC 7.5 typically points to a conflict between your Windows version and the WinCC Service Pack (SP), or an issue with the Microsoft SQL Server instance used by WinCC. Common Solutions
Always use simple, ASCII-only character paths for project storage. Avoid using special characters or long directory structures. This public link is valid for 7 days
WinCC 7.5 was originally designed for Windows 10. Running it on Windows 11 may introduce compatibility issues. Check Siemens Compatibility Tool for specific Windows 11 version support. Many users have reported that Windows 11 Pro requires specific updates and configurations to run WinCC 7.5 SP2.
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Before diving into complex diagnostics, check these common culprits. In 50% of cases, the issue lies here.
| If none of the above works | Action | |----------------------------|--------| | | Run WinCC setup → Select Repair . | | Uninstall/Reinstall WinCC | Use Siemens’ Total Uninstall tool first. | | Restore VM snapshot | If running on a virtual machine (VMware/Hyper-V). | | Contact Siemens Support | Provide error log from C:\ProgramData\Siemens\WinCC\Diagnostics .
WinCC utilizes the Simatic Shell terminal bus for internal communication, even on standalone single-user systems. Open Windows File Explorer and click on . Look for Simatic Shell in the left-hand navigation pane. Right-click Simatic Shell and select Settings .
Ensure your Windows account is added to the SIMATIC HMI , SIMATIC HMI VIEWER , and SQLServer2005SQLBrowserUser$ groups. 4. Check for Port Conflicts & Firewalls