UPDATE: So I was FINALLY able to get the basic part of it working but now I'm running into an odd problem that I can't seem to work out.

I got the following code to complete one full request from a Windows server basic Perl client to the Ubuntu machine OR I can telnet to localhost on the Ubuntu machine and type a manual command. Either option results in a connection refused message if I try to send a second request from either side and for the life of me I can't figure out how (or where) to fix it.

#!/usr/bin/perl -w
use strict;
use warnings;

use IO::Socket::INET;

my $sock = IO::Socket::INET->new(
    LocalPort => 8000,
    Listen      => 10,
    Reuse      => 1
);
die "Cannot create socket $!\n" unless $sock;

print "Server waiting for client to connect on port 8000\n";

$| = 1; # autoflush

my $client = $sock->accept();

my $handle;
my $clientHost = "10.20.0.30";
my $clientPort = "8000";

while(){

    while ($client) {
    
        # receive data, pass data via variable to dedicated subroutine
                # based on pattern matching
        my $recv_msg = &recv(); # handles recv() activity


        if ($recv_msg =~ /ADD/) {
            ADD( $recv_msg );
            # shutdown ($client, 2);
        }
        elsif ( $recv_msg =~ /STK/ ) {
            STK( $recv_msg );
            # shutdown ($client, 2);
        }
    }
}
# $sock->close();

sub connection {

    my ($host, $port) = @_;    

    $handle = IO::Socket::INET->new (
            PeerHost => $host,
            PeerPort => $port,
            Proto      => "tcp")
    or $handle = 0;

    if ($handle != 0) {
        $handle->autoflush(1);    # output gets there right away
    }
    else {
        print "Can't connect to host from sub connection.";
    }
    return $handle;
}

sub ADD {    

    my ( @data ) = @_;

    sendRequest($data[0]);
    print "Data after socket->send: $data[0]\n";
    print "This message is an ADD request.\n";

    $handle->close();
    $sock->close();
}

sub STK {    
    my ( @data ) = @_;

    sendRequest($data[0]);
    print "Data after socket->send: $data[0]\n";
    print "This message is a STK request.\n";

    $handle->close();
    $sock->close();
}

sub recv {
    my $msg = "";

    $client->recv($msg, 12000);

    return $msg;
}

sub sendRequest {
    my ($reqSock, $msg) = @_;
    &sender($reqSock, $msg);
}

sub sender {
    my ($reqMsg) = @_;

    $handle = connection($clientHost, $clientPort);

    eval {
        $handle->send($reqMsg);
    };
    print 'Crash: '.$@ if $@;

    if ($@) {
        print "Connection Reset";
        $handle->close;
        # $handle = connection($clientHost, $clientPort);
        eval {
            $handle->send($reqMsg);
        };
    }
}
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