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Beckhoff Information System - English
Check Firewall Ports
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Open port - Wikipedia
Test UDP connection with PowerShell - Cloudbrothers
Simple Port Tester v.3.0.0 | PcWinTech.com™
How do I know if a TCP port is open or closed? - Synology Knowledge Center
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Test-NetConnection: Check for Open/Closed Ports from PowerShell | Windows OS Hub
LiveTcpUdpWatch - View TCP/UDP network activity of every application on Windows
