The loader successfully validated the project but cannot establish communication with the target runtime environment. This is almost always a firewall, SQL, or User Account Control (UAC) issue.
WinCC Runtime Classic (pre-TIA) checks for a physical graphics adapter. Remote sessions use a virtual display driver. wincc runtime loader
A child process (e.g., a custom C-script or a SQL query) did not terminate gracefully. The loader is waiting for a handle that will never close. The loader successfully validated the project but cannot
But what exactly is the WinCC Runtime Loader? Is it the application itself, or just a launcher? Why does it sometimes stay running after a project closes? wincc runtime loader
The loader is failing its pre-flight checks—most commonly a missing or corrupted license or an incompatible graphics driver (for WinCC Advanced/Comfort panels).