Oh Monks!

I have a problem with unholy sockets - I can listen on port and connect to it from localhost, but from a remote host - I cannot. When I try the same port with netcat on listen mode - no problem, so the port is not blocked

The pseudo server code:

#!/usr/bin/perl -w 

use strict; 
use IO::Socket; 
use IO::Handle;

use Fcntl qw(:DEFAULT);
use POSIX qw(:errno_h);

    my $port = shift or return;

    my $sock = new IO::Socket::INET( 
    LocalHost => 'localhost', LocalPort => $port, 
    Proto => 'tcp', Listen => SOMAXCONN, 
    Reuse => 1); 

    $sock or die "could not create socket: $!"; 

    #.......listening on port
    print "___accepting on port $port...\n";

    my ($new_sock, $c_addr) = $sock->accept();
    my ($client_port, $c_ip) =sockaddr_in($c_addr); 
    my $client_ipnum = inet_ntoa($c_ip); 
    my $client_host =gethostbyaddr($c_ip, AF_INET); 

    print "got a connection from: $client_host [$client_ipnum] at port
+ $port\n";
    
close $sock;
close $new_sock;
exit;
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When I try to connect I get:

telnet 212.31.100.100 20
Trying 212.31.100.100...
telnet: connect to address 212.31.100.100: Connection refused
telnet: Unable to connect to remote host
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Any idea?