![]() ![]() 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: ![]()
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