A specific bug in WinCC RT Viewer causes hangs at 98% completion. Apply this registry fix:
An ounce of prevention is worth a pound of cure.
: For HTTP/HTTPS configuration downloads via IIS. Port 135 : For RPC (Remote Procedure Call) endpoint mapping.
Add server to Trusted Sites; enable ActiveX permissions in Internet Options. Antivirus or firewall packet inspection clipping the file. wincc viewer rt download fix
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:
Beyond the shortcut, here are some standard "fixes" for common WinCC Viewer RT errors: "Failed to create empty document"
You do not need to download the full multi-gigabyte WinCC setup file on every client machine just to get the viewer. A specific bug in WinCC RT Viewer causes
The project was massive: a multi-million dollar manufacturing plant that relied on Siemens WinCC
WebNavigator clients on 64-bit machines frequently fail to install because of missing Visual C++ libraries.
Windows Defender Firewall frequently blocks the ports required for WinCC Viewer RT to communicate with the server project. Required Ports to Open Port 135 : For RPC (Remote Procedure Call) endpoint mapping
Before diving into specific fixes, it helps to understand why the download process typically fails:
Ensure that Siemens SQL Server Express instances are not restricted by Windows Group Policies. Checklist: WinCC Viewer RT "Loading Picture" Fix