C:\Program Files (x86)\Siemens\WinCCC:\ProgramData\Siemens\Automation%TEMP%\SIEMENS_*A known bug in older WinCC versions (e.g., before Update 14) causes the WinCC Viewer RT download service to hang when symbol rates exceed 500 tags.
Investigation revealed three primary root causes:
If you cannot disable the firewall permanently, configure these inbound rules on the Target PC:
| 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 |
PowerShell script to add the rule (run as Admin):
New-NetFirewallRule -DisplayName "WinCC RT Download" -Direction Inbound -Protocol TCP -LocalPort 50515-50520 -Action Allow
C:\Program Files (x86)\Siemens\WinCCC:\ProgramData\Siemens\Automation%TEMP%\SIEMENS_*A known bug in older WinCC versions (e.g., before Update 14) causes the WinCC Viewer RT download service to hang when symbol rates exceed 500 tags.
Investigation revealed three primary root causes:
If you cannot disable the firewall permanently, configure these inbound rules on the Target PC:
| 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 |
PowerShell script to add the rule (run as Admin):
New-NetFirewallRule -DisplayName "WinCC RT Download" -Direction Inbound -Protocol TCP -LocalPort 50515-50520 -Action Allow