/// <summary>
        /// netsh http delete urlacl http://*:8888/
        /// </summary>
        public void ReleaseLocalPort()
        {
            string arguments = String.Format("http delete urlacl http://*:{0}/", port);

            if (RunNetsh(arguments))
            {
                try
                {
                    var firewallManager = new FirewallManager(port, firewallRuleName);
                    firewallManager.ClosePort();
                }
                catch (Exception ex)
                {
                    throw new WardenException(String.Format("Error removing firewall rule for port '{0}', user '{1}'", port, userName), ex);
                }
            }
            else
            {
                throw new WardenException("Error removing reservation for port '{0}'", port);
            }
        }
        /// <summary>
        /// netsh http add urlacl http://*:8888/ user=warden_094850238
        /// </summary>
        public ushort ReserveLocalPort()
        {
            string arguments = String.Format("http add urlacl http://*:{0}/ user={1}", port, userName);

            if (RunNetsh(arguments))
            {
                try
                {
                    var firewallManager = new FirewallManager(port, firewallRuleName);
                    firewallManager.OpenPort();
                }
                catch (Exception ex)
                {
                    throw new WardenException(String.Format("Error adding firewall rule for port '{0}', user '{1}'", port, userName), ex);
                }
            }
            else
            {
                throw new WardenException("Error reserving port '{0}' for user '{1}'", port, userName);
            }

            return(port);
        }