We're trying to monitor an external website that requires us to go through our proxy server. We've setup and "Advanced Http" sensor and have configured the proxy settings in the appropriate place, but the sensor always responds with:
"HTTP/1.1 407 Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied. )"
Looking at the proxy logs, it looks like PRTG is not using the username\password provided in the sensor settings - the logs say that it is trying to use "anonymous". Can you provide any information as to why this could be?