For this test, PortQry does the following: PortQry refines its port status report by using a second set of tests that can interact with the service or program that's listening on the target port. This is especially true in an environment that contains one or more firewalls. However, when you troubleshoot a connectivity problem, it's useful to know whether a port is being filtered or is listening. If there's no response from a target UDP port, PortQry reports that the port is LISTENING or FILTERED. By default, PortQry queries a TCP port three times before it returns a response of FILTERED, and queries a UDP port one time before it returns a response of FILTERED. A process may or may not be listening on the target port. PortQry didn't receive a response from the target port. FILTERED: This response indicates that the target port is being filtered.PortQry received one of the following ICMP messages from the target port: NOT LISTENING: This response indicates that no process is listening on the target port. PortQry received a response from the target port.
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