Thread: Using Microsoft PorQryUI (Port Query) To Test For Open Ports

PortQry is graphical addition of command line utility portqry.exe that began with Windows 2000. It executes on Windows 2000, Server 2003 and XP with TCP/IP installed.

PortQry reports the port status of TCP and UDP ports on a PC that you select and reports status in one of the following three ways.

Listening

a method is listening on port on PC that you chosen. Portqry.exe received a reply from port.

Not listening

not any method is listening on destination port on target system. PortQry got an Internet Control Message Protocol (ICMP) "Destination Unreachable - Port Unreachable" message from destination UDP port.

Filtered

The port on PC that you chosen is being filtered. PortQry did not get a reply from port. A method may or may not be listening on port. TCP ports are queried three times, and UDP ports are queried one time before a report specifies that port is filtered.