You can run PortQry at a command prompt in the same manner as any other command-line tool. When you use the local-mode parameters at the command line, you can do tasks such as the following on the local computer:įor more information, see Using PortQry in local (command-line) mode. When you have to troubleshoot ports on the computer where you installed PortQry, use PortQry in local mode. PortQry parses, formats, and then returns the response from the service or program as part of its test report.Īdditional tests to troubleshoot the local computer.Mspclnt.ini file information (ISA Server queries).Whether anonymous access is allowed (FTP queries).Registered client services and ports (RPC queries).Domain and domain controller information (LDAP queries).Depending on the service or program, the message may request information that's useful for troubleshooting, such as the following: PortQry creates a message that is specifically constructed for the expected service or program, and then sends that message to the target port.PortQry uses the Services file that's located in the %SYSTEMROOT%\System32\Drivers\Etc folder to determine which service listens on each port.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. LISTENING: This response indicates that a process is listening on the target port.PortQry reports the status of a port as one of three values: To produce more accurate and useful results, PortQry uses a two-step testing process. Typically, the service or program that listens to a port responds only to a message that uses a specific session layer or application layer protocol. Most services don't respond to an unformatted user datagram that's sent to them.If there's no response to a directed datagram, the target port might be FILTERED.This result may not be accurate for one or both of the following reasons: Typical port scanning tools report that the port has a LISTENING status if the target UDP port doesn't return an Internet Control Message Protocol (ICMP) "Destination unreachable" message. To get the PortQryUI tool, see PortQryUI - User Interface for the PortQry Command Line Port Scanner. PortQryUI has several features that can make using PortQry easier.
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You can download a separate tool, called PortQryUI, that includes a graphical UI for PortQry. Similar to command-line mode, but you can use shortcut commands and parameters. In this mode, you can use several parameters that are intended for troubleshooting the local computer. You can use this mode to troubleshoot local or remote computers. You can use PortQry from a command prompt in one of several modes: It also provides detailed information about the local computer's port usage.īecause PortQry is intended to be used as a troubleshooting tool, users who use it to troubleshoot a particular problem should have sufficient knowledge of their computing environment. This tool reports the status of target TCP and User Datagram Protocol (UDP) ports on a local computer or on a remote computer. PortQry is a command-line tool that you can use to help troubleshoot TCP/IP connectivity issues.
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Applies to: Windows 10 - all editions, Windows 8.1, Windows 8, Windows 7, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003 Summary