Knowledgebase
How to tell if a port is open
Posted by Diane Hancock on 20 April 2018 01:04 PM

To determine if a port such as 80 has been opened on a server, do the following on the machine trying to connect to the server.

1. Download the PortQry utility (see https://www.microsoft.com/en-us/download/confirmation.aspx?id=17148 to download)

2. Install the PortQry utility.   Note, the example below assumes it will be installed to C:\PortQryV2 but it does not have to be.

3. Open a command line prompt (i.e. Windows > Run > cmd)

4. Type the following command replacing <server-name or ip> with the server name or the ip address. 

Note, if portqry was not installed in the C:\PortQryV2 directory, then change that to the installation location.

c:\PortQryV2\portqry -n <server-name or ip>

The ports should be listed.  For example:

TCP port 80 (http service): LISTENING

The possible results after the colon and their meanings are:

  • Listening = the server is listening on the specified port (i.e. it is open)
  • Filtered = likely indicates a firewall or software issue
  • Not Listening = it didn't receive a response at all

 


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