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@A-B-B This is related to firewall configuration of the server which doesn't give any response to prevent any SYN flood attacks. Running telnet canyouseeme.org 81 also hangs. This is controlled by your timeout limits which probably are hardcoded in bash. See: decrease TCP connect() system call timeout.

kenorb
– kenorb

2016-10-18 09:37:36 +00:00
Commented Oct 18, 2016 at 9:37
For parametrization, it now seems to be necessary to specify $SERVER and $PORT with braces, at least as ${SERVER} and ${PORT}.

Asclepius
– Asclepius

2016-10-20 21:41:33 +00:00
Commented Oct 20, 2016 at 21:41

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