Hello,
thank you for your inquiry.
The Sensor uses the following URL's, please mind the * wildcard:
As for the sensor's channels, the sensor is created by default (on all probes) with all channels, but you may delete and manually re-create the sensor, this will allow you to select only the services/providers which you want to monitor.
Note about proxy/firewalls: The queries performed by the sensor don't use an API Key or any sort of authentication. As a result, many of the websites reply with HTTP codes in the 4xx ~ 5xx range. Example: 401, 400, 403 and so on. The sensor has been adjusted to expect these codes as a valid response.
Firewalls and proxies may deny URL's with a 4XX error code (which is the expected reply, unless it silently drops the requests). This can lead to false positives, unreachable services (blocked by the firewall) would show up as "Working" in the sensor when blocked with a 4XX HTTP Code. The response times for these services would also be unusually low, since the sensor is actually measuring the response time of the denied message from the firewall/proxy.
Best Regards,
Luciano Lingnau [Paessler Support]
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