web.config iis proxy to localhost

<?xml version="1.0" encoding="UTF-8"?>
<configuration>  
  <system.net>  
	<defaultProxy>
		<proxy usesystemdefault="true" proxyaddress="http://45.117.171.21:6868" bypassonlocal="true" />
 	</defaultProxy>
  </system.net>
    <system.webServer>
        <rewrite>
            <outboundRules>
                <preConditions>
                    <preCondition name="ResponseIsHtml1">
                        <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" />
                    </preCondition>
                </preConditions>
            </outboundRules>
            <rules>
                <rule name="ReverseProxyInboundRule1" stopProcessing="true">
                    <match url="(.*)" />
                    <action type="Rewrite" url="http://localhost:6868/{R:1}" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>  
</configuration>