When troubleshooting various connectivity issues, one item users should check is whether that port is open on server. If you’ve ever wondered how to check if port is open, this article may help. There are various ways to check if port is open.
One easy way to handle this without having to add any additional software is an application command.
You can start checking if a port is open by issuing the command. If it’s open, you’ll see a blank screen right after issuing the command like;
[domainname or ip] [port]
Here, [domainname or ip] is domain name or the IP address of the required server that you’re trying to connect.
[port] here, is the port number that the server is listening
If this port is open, you’ll see a blank screen. It means that your connection was successful. However, if the port is closed, you’ll receive a message like “Connect failed.”
How to check if port is open
The Transmission Control Protocol or TCP port 443 is a default port which is used by HTTPS or Hypertext Transfer Protocol Secure. If this port has been blocked by the server or device from a computer to a specified destination, for instance, www.iwm.com, your connection to a https site may fail, and the browser will display an error message such as “Secure Connection Failed” or even “Page Cannot Be Displayed.” Nevertheless, the two most prevalent locations for such failure are at your router or workstation.
Open your web browser and try to load different https sites, like your bank’s website, and https://www.iwm.com, for instance. If one of these successfully connects, port 443 is open. To determine if the port 443 is open on a remote server address, continue with the following steps.
Click “Start” and place your cursor in “Search” box.
Type “cmd” and press “Enter.”
Type “the servername.domain.com 443. For example, iwm.com. If you see a blank screen and a flashing cursor, then port 443 is open. If this port is closed, you’ll see “Could not open connection to host port 443 error message.
To know how to check if port is open, the above steps are essential.
If you must pinpoint the precise location where the port 443 is blocked, then type “tracert www.enterwebserveraddress.com. Replace the server address for the destination address and then press “Enter.” Your workstation can begin tracing the network trail to the destination. Every “hop” represents a transitional router the trace has to travel through.
You can check these “hop” locations by inserting “server name,” followed by the initial hop’s IP address. Implement the command by pressing “Enter.” Any address that gives you “connect failed” error message is the culprit device. So many web-based tools can be used for telling which ports are closed or opened.