Troubleshooting a failing download to WinCC Viewer RT can be a headache, especially when your remote SCADA monitoring depends on it. Whether you're seeing a "Failed to create empty document" error or the system simply won't connect, this guide will walk you through the most effective fixes. Fixing WinCC Viewer RT Connection & Download Failures
Cons
The download process requires local administrator rights and the “Enable WinCC User” group membership. Standard user accounts lack permission to write to system folders.
Fix: WinCC Viewer RT "Download Failed" and Connection Errors
If the Viewer RT opens but fails to display data or shows a black background: Regenerate RT License
Do not use third-party links. The WinCC Viewer RT must be downloaded as part of the SIMATIC WinCC Trial or delivered via the Siemens Industry Online Support (SIOS) portal.
Firewall Settings: Temporarily disable the Windows Defender Firewall on both machines to see if the download succeeds. If it does, create specific exceptions for WinCC and SQL Server processes.
.RTZ file (TIA → WinCC RT → Export).WinCC_RT_Viewer.exe -import "project.rtz"