Run the WinCC Web Configurator on the server to ensure the web pages are published correctly. Then, recreate your .pnc file on the client PC by running the "WinCC Viewer RT" application and selecting "New" to input the server's IP and the start screen. Fix C: Update the WebNavigator Component
If you are experiencing "Download Failed" errors or "Server Not Available" messages, try these verified solutions: Fix A: "Download Failed" or Compilation Errors
If the viewer connects but shows a black background or missing SVG symbols: License Refresh: Go to the Computer Properties in WinCC, uncheck Enable Runtime Viewer
Ensure both computers are visible in the shell list before attempting the download again. 3. Permissions & Security Fixes SIMATIC HMI Group: Ensure your Windows user is a member of the SIMATIC HMI local user group. Firewall Exception:
: C:\Users\ \AppData\LocalLow\Siemens\SIMATIC.WinCC\WebNavigator\Client\ .
Common causes (why it happens)