We want to check some web sites availability from a special server (named "A" for instance) which has access to internet via a proxy server (named "B" for instance). so in PRTG server (named "C" for instance)we added a http sensor for server "A" and in "Proxy settings for http sensors" entered Name & port of server"B" (there is no need for Credentials).after all HTTP sensor is "Down" with this Error message: HTTP/1.1 502 Proxy Error ( Forefront TMG denied the specified Uniform Resource Locator (URL). )
beside this our proxy server(B) is TMG & all needed rules are added.
The Rule which makes Sensor Status "Down" From: Server"A" To: All networks Users: All users Protocols: HTTP & HTTPs
PRTG Server(C) has no access to internet via the proxy but when it is allowed to connect to internet via the proxy server, sensor status changes to "UP".
The Rule which makes Sensor Status "UP": From: PRTG Server(C) To: All networks Users: All users Protocols: HTTP & HTTPs
it seems that it checks that URL from PRTG Server(C) through Proxy. how can we check that website from Server A not PRTG?