The following server and client don't talk, but if I change the port numbers, they just become fine. I wonder whether there is something special with port 25 on windows XP. I know it is for smtp and that's the purpose. if I stop my server, netstat -a shows nothing listening on that port, so the port is available.

server

use warnings;
use strict;

use IO::Socket::INET;

my $server = new IO::Socket::INET(Proto => "tcp",
                                  LocalAddr => "localhost",
                                  LocalPort => 25,
                                  Listen => 10) ||
             die "Failed to initialize socket\n";
print "Socket initlaized\n";
my $connection = $server->accept();
print "connect\n";
while (<$connection>) {
        print $_;
}
[download]

client

use warnings;
use strict;

use IO::Socket::INET;

my $server = new IO::Socket::INET(Proto => "tcp",
                                  PeerAddr => "localhost",
                                  PeerPort =>25);
[download]

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