use strict;
use warnings;

use IO::Socket::SSL;
 
# auto-flush on socket
$| = 1;
 
# creating a listening socket
my $socket = new IO::Socket::SSL (
    LocalHost => '0.0.0.0',
    LocalPort => '7777',
    Proto => 'tcp',
    Listen => 5,
    Reuse => 1,
    SSL_cert_file => 'cert.pem',
    SSL_key_file => 'key.pem',
);
die "cannot create socket $!\n" unless $socket;
print "server waiting for client connection on port 7777\n";
 
while(1)
{
    # waiting for a new client connection
    my $client_socket = $socket->accept() or die "SSL_ERROR = :$SSL_ERROR:\n";
 
    # get information about a newly connected client
    #my $client_address = $client_socket->peerhost();
    #my $client_port = $client_socket->peerport();
    #print "connection from $client_address:$client_port\n";
 
    # read up to 1024 characters from the connected client
    my $data = "";
    $client_socket->recv($data, 1024);
    print "received data: $data\n";
 
    # write response data to the connected client
    $data = "ok";
    $client_socket->send($data);
 
    # notify client that response has been sent
    shutdown($client_socket, 1);
}
 
$socket->close();

##</code><code>##

use strict;
use warnings;
use IO::Socket::INET;
use IO::Socket::SSL;
 
# auto-flush on socket
$| = 1;
 
# create a connecting socket
my $socket = new IO::Socket::SSL (
    PeerAddr => '192.168.1.59',
    PeerPort => '7777',
    Proto => 'tcp',
    Domain => AF_INET,
);
die "cannot connect to the server :$!: :$SSL_ERROR:\n" unless $socket;
print "connected to the server\n";
 
# data to send to a server
my $req = 'hello world';
my $size = $socket->send($req);
print "sent data of length $size\n";
 
# notify server that request has been sent
shutdown($socket, 1);
 
# receive a response of up to 1024 characters from server
my $response = "";
$socket->recv($response, 1024);
print "received response: $response\n";
 
$socket->close();

##</code><code>##

SSL accept attempt failed because of handshake problems error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca