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[ICMP] reason subcode 0x3, used with [ICMP] reason code 0x3 to explain why a DestinationUnreachable message was sent. It is usally generated by a host when there is no application listening on the specified port. The destination port on the targeted host is closed (a.k.a. not in a listening state).
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DestinationPortUnreachable
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ECONNREFUSED