A Basic Application Could Not Be Started Wincc 75 Best Guide

When the error pops up in a live environment:

| Step | Action | Time | |------|--------|------| | 1 | Run as Administrator | 10 sec | | 2 | Restart SQL Service (services.msc) | 30 sec | | 3 | Check Dongle / License Manager | 30 sec | | 4 | Delete cache folders (GRACS, NO_MSG) | 20 sec | | 5 | Restart PC | 2 min |

If none of these work, you are likely dealing with a corrupted SQL instance or a Windows OS conflict. In that case, the "best" ultimate solution is a clean installation of Windows 10 LTSC 2019 (the officially recommended OS for WinCC 7.5) followed by a fresh WinCC installation.

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. a basic application could not be started wincc 75 best

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.

    Sometimes the main project file (.mcp) or the Global Script library has a logical error preventing startup. When the error pops up in a live

    WinCC 7.5 is highly sensitive to User Account Control (UAC). If the application does not have administrative rights, it cannot start critical background services.

    How to fix it:

    Pro Tip: To make this permanent, go to Properties > Compatibility > Check "Run this program as an administrator." Then click "Change settings for all users." If you use a USB dongle, try a

    Why this works: SQL Server services and license daemons require elevated privileges to write logs and check licenses.

    | Symptom | Solution | |---------|----------| | Error only in one project | Use Project Duplicator to create fresh copy | | Error after moving project | Check path length < 80 chars, no special characters or spaces | | Error after Windows Update | Run WinCC Installation Repair from Control Panel → Programs → Siemens WinCC → Change → Repair | | Multi-user / client-server | Verify network share permissions (full control for Everyone temporarily for test) |

    WinCC 7.5 uses SQL Server 2016/2019 Express.

    If stopped: right-click → Start. If fails to start → reinstall SQL instance (Fix 6).

    Whitelist the following folders in your antivirus: