Test for open ports from using Telnet, Portqry or Powershell
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How do I know if a TCP port is open or closed? - Synology Knowledge Center
How do I know if a TCP port is open or closed? - Synology Knowledge Center
How to telnet to a port using telnet on Windows 10 - Open Port
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4 Easy methods for how to check if port is open on Windows - Open Port
