c# - Check that VPN ports are open -


is there way check udp ports 500 , 4500 of vpn server responding ? goal check if firewall or blocking these ports.

thanks in advance

so, udp doesn't acks or connections tcp does; way sure port responding send data , response (there no requirement respond though).

since these specific ports, assume there specific application/protocol looking at. need open port , either send garbage data or form of identification payload (depending on protocol).

this previous question outlines need handle that.


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