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 or 5432 has been opened on a server, do the following on the machine trying to connect to the server.
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 and <port> with the port number.
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> -p TCP -e <port>
If the port is open, it should be listed with status of LISTENING. For example:
TCP port 80 (http service): LISTENING
The possible status values (after the colon) are: