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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Applies to: Windows 10 - all editions, Windows 8. It also provides detailed information about the local computer's port usage. Because 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 result may not be accurate for one or both of the following reasons:.

However, when you troubleshoot a connectivity problem, it's useful to know whether a port is being filtered or is listening. This is especially true in an environment that contains one or more firewalls. 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.

For this test, PortQry does the following:. When you have to troubleshoot ports on the computer where you installed PortQry, use PortQry in local mode. When you use the local-mode parameters at the command line, you can do tasks such as the following on the local computer:.

For more information, see Using PortQry in local command-line mode. You can run PortQry at a command prompt in the same manner as any other command-line tool. Most of the examples in this article show command-line PortQry commands.

In command-line mode, you can add multiple options to the command string to specify what query to run and how to run it. To run PortQry in command-line mode, run a command that uses the following syntax:. This parameter is required. It's not important whether the DNS server returns a positive or negative response. Any response indicates that the port is listening.

Instead of querying a port on a remote target computer, you can use PortQry in local mode to get detailed information about the TCP ports and the UDP ports on the local computer where PortQry runs. Use the following syntax to run PortQry in local mode:.

When you troubleshoot connectivity issues between computers, you might have to type many repetitive commands. Such actions might be done more easily by using PortQry in interactive mode. To start PortQry in interactive mode, use the -i parameter. For example, run the following command:. You can use the following shortcuts together with the query command to run common queries without having to set port and protocol options. Use the following syntax:.

If you omit the shortcut, the q command queries TCP port For example, entering q dns in interactive mode is equivalent to running portqry -n You can use the set command to set options such as the source port or slow link delay. Suppose you want to query a computer that has the IP address At the interactive mode command prompt, enter n This command produces output that resembles the following excerpt:.

To send a DNS query, enter q dns at the interactive mode command prompt. PortQry uses this file to resolve port numbers to their corresponding service names. PortQry uses this information to select the format for its queries. You can edit this file to direct PortQry to send formatted messages to an alternative port. For example, the following entry appears in a typical Services file:. You can edit this port entry or add an additional entry. When you run PortQry in local mode, as in the previous example, you might see output that resembles the following excerpt.

Such output indicates that the security context that PortQry is using doesn't have sufficient permissions to access all of the information that it requested. The following command queries the default UDP port on a computer that's specified by using its computer name:.

The following command runs the same query as the previous command but skips the name resolution step:. The following command queries UDP ports , , and in that sequence on the computer "myServer":.

The following command queries the range of ports from port to port inclusive on the computer "myServer":. The following command queries TCP port on mail. If the file already exists, PortQry overwrites it without prompting for confirmation.

The following command queries TCP ports , , and 25 on mail. For each target port, PortQry waits twice as long as usual for a response. The following command uses UDP port if it's available on the local computer to send a query to UDP port 53 on If a service is listening on that port and responds to the query, it sends the response to UDP port on the local computer.

By default, the LDAP service should be listening on this port. If the LDAP service responds to the first query, PortQry uses an ephemeral source port to send the formatted query and receive any responses. When this batch file runs, PortQry produces a log file that is named pqlog. The content of this file resembles the following:.

The following command queries UDP port on the myServer computer. By default, the RPC service should be listening on this port. From this output, you can determine not only whether the service is listening on the port, but also which services or programs are registered with the RPC endpoint mapper database on the destination computer. The output includes the universal unique identifier UUID for each program, the annotated name if one exists , the protocol that each program uses, the network address that the program is bound to, and the program's endpoint in square brackets.

When you specify the -r option in the PortQry command to scan a range of ports, PortQry doesn't query the RPC endpoint mapper for endpoint information. This parameter accelerates scanning a range of ports. Skip to main content.

This browser is no longer supported. Download Microsoft Edge More info. Table of contents Exit focus mode. Table of contents. Note It's not important whether the DNS server returns a positive or negative response. Note Each of the examples in this section queries port 80, the default port. Note When you specify the -r option in the PortQry command to scan a range of ports, PortQry doesn't query the RPC endpoint mapper for endpoint information.

In this article. This is the only required parameter for command-line mode. This value cannot include spaces. The default value is tcp. The default value is Do not use spaces around the commas. Do not use spaces around the colon. The starting port number must be smaller than the ending port number. When the command runs, PortQry creates the log file in the directory where it's installed.

If the file already exists, PortQry asks you to confirm that you want to overwrite it unless you also use the -y parameter. When you use -y together with -l , PortQry overwrites the existing log file without prompting you to confirm the action. If the PortQry command string does not include -l , PortQry ignores -y.

When you query over slow or unreliable network links, the normal wait time may be too short to receive a response. By default, when you use -n to specify an IP address for the target computer, PortQry does a reverse name lookup to resolve the IP address to a name.

This process may be time-consuming, especially if PortQry can't resolve the IP address. Use -nr to skip this step of the query. If you use -n to specify a computer or domain name, PortQry ignores -nr. PortQry can't use a port that another process is already using. If the port that you specify is already in use, PortQry returns the following error message: Cannot use specified source port. Port is already in use. Specify a port that is not in use and run the command again.

When this occurs, PortQry records "Using ephemeral source port" in its output. To temporarily turn off the IPSec policy agent so that you can use port , run net stop PolicyAgent. When you have finished testing, run net start PolicyAgent.

You must delimit this value by using exclamation points, as shown in the left column. The default community name is public. When you use -q , PortQry suppresses all screen output except for error messages. To see output other than error messages, use -q together with -l. PortQry records the normal output in the log file. If a log file already exists and you use -q together with -l , PortQry overwrites the existing log file without prompting you.