curl -v -H "Content-Type: application/xml" --user *******:******* -X GET http://*.*.*.*/ISAPI/

<?xml version="1.0" encoding="UTF-8"?>
<ResponseStatus version="2.0" xmlns="http://www.hikvision.com/ver20/XMLSchema">
<requestURL>/ISAPI</requestURL>
<statusCode>4</statusCode>
<statusString>Invalid Operation</statusString>
<subStatusCode>invalidOperation</subStatusCode>
</ResponseStatus>

curl -v -H "Content-Type: application/xml" --user ***:*** -X GET http://*.*.*.*/ISAPI/System/Network/UPnP

<?xml version="1.0" encoding="UTF-8"?>
<ResponseStatus version="2.0" xmlns="http://www.hikvision.com/ver20/XMLSchema">
<requestURL>/ISAPI/System/Network/UPnP</requestURL>
<statusCode>1</statusCode>
<statusString>OK</statusString>
<subStatusCode>ok</subStatusCode>
</ResponseStatus>