You want to limit the number of lines to the shortest workable number. Since you problem is with the server hanging, I reduced your script to the minimum necessary.
#!/usr/bin/perl
use strict;
use warnings;
use IO::Socket::INET;
my $sock = IO::Socket::INET->new(
Listen => 5,
LocalHost => 'localhost',
LocalPort => 12400,
Proto => 'tcp',
Timeout => 15,
Blocking => 0)
or die "Couldn't create socket: $!\n";
Blocking is default unless Blocking is set to 0, which is nonblocking.
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