Product: SIMATIC WinCC (TIA Portal) Viewer RT
Issue: Download of the Runtime project to a target device (PC/Embedded) fails, gets stuck, or aborts with generic errors.
Environment: TIA Portal V13–V19, Windows 10/11 LTSC, WinCC RT Professional/Advanced.
If you cannot disable the firewall permanently, configure these inbound rules on the Target PC: wincc viewer rt download fix
| Port | Protocol | Service/Tool | |------|----------|---------------| | 102 | TCP | S7 Communication | | 135 | TCP | RPC Endpoint Mapper | | 1433 | TCP | SQL Server (WinCC DB) | | 50515–50520 | TCP | WinCC Download Service | Product: SIMATIC WinCC (TIA Portal) Viewer RT Issue:
PowerShell script to add the rule (run as Admin): If you’re reading this, you’ve likely encountered a
New-NetFirewallRule -DisplayName "WinCC RT Download" -Direction Inbound -Protocol TCP -LocalPort 50515-50520 -Action Allow
If you’re reading this, you’ve likely encountered a frustrating issue: the WinCC Viewer RT download either fails, stalls, throws cryptic error messages, or refuses to start altogether. Whether you’re an automation engineer, maintenance technician, or system integrator, a broken WinCC Runtime Viewer download can bring production monitoring to a halt.
This article provides a step‑by‑step guide to diagnosing and fixing the most common WinCC Viewer RT download problems. We’ll cover everything from basic network checks to registry tweaks, file permission issues, version mismatches, and advanced Siemens‑specific troubleshooting.