A Basic Application Could Not Be Started Wincc 75 Best Here

WinCC uses DCOM (Distributed Component Object Model) for inter-process communication. If Windows Updates changed DCOM security permissions, WinCC cannot "call

A very common cause for this specific error message is a corrupt Tag Logging database. If the Quick Start file or the database archive is damaged, the runtime manager crashes immediately.

| Cause Category | Specific Issue | |----------------|----------------| | Windows Permissions | 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 BasicApplication.log (located typically at): a basic application could not be started wincc 75 best

C:\Program Files (x86)\Siemens\WinCC\Diagnostics\BasicApplication.log

Look for ERROR or FAILED entries near the timestamp when you start WinCC.

If none of these work, please share:

This will help narrow down whether it's a missing DLL, service dependency, or license issue. WinCC uses DCOM (Distributed Component Object Model) for

When encountering the issue where a basic application could not be started in WinCC 7.5, there are several steps and potential solutions you can explore to resolve the problem. WinCC (Windows Control Center) is a supervisory control and data acquisition (SCADA) system from Siemens, used for monitoring and controlling industrial processes. Here are some steps to troubleshoot and possibly fix the issue:

WinCC 7.5 uses a named instance of SQL Server (typically WINCC). If this instance is corrupted, the basic application cannot start because the database is the "basic application."

How to repair:

Critical Note: Always backup your WinCC projects before repairing SQL. Use the CCCMigrate.exe tool (found in C:\Program Files (x86)\SIEMENS\WinCC\Tools\) to export your data.

Without a valid license, WinCC will stall at the "basic application" stage. However, the error message does not explicitly say "license missing." It’s a silent killer.

How to verify:

  • If you use a USB dongle, try a different USB port or reinstall the ALM driver.
  • Run the "License Cleanup Tool" (available from Siemens support) to remove ghost licenses.

    • Hidden fix: Delete the folder C:\AX NF ZZ (license cache) and restart the ALM service. The folder will be recreated with fresh license data.