A PowerShell test is a type of script that tests the functionality of your scripts, either before running them or as part of their runtime. A lot can be learned from using this powerful tool to its full potential.
The “powershell test-connection port example” is a command that can be used to check if a connection is open on the local machine. It uses Test-Connection and Port.
We had several alternative command-line tools to pick from before the PowerShell Test-NetConnection cmdlet to diagnose various network connection problems.
Ping was used to test ICMP echoes and answers; tracert was used to examine where our packets were being lost; nslookup was used to execute DNS queries against our DNS servers; telnet was used to check for open TCP ports, and other tools were used as well. For everything, there was a utility.
This single-utility-for-a-single-task strategy to debugging connection difficulties has become outdated with the arrival of PowerShell v4 on Windows 8.1 and Windows Server 2012 R2.
Allow me to introduce you to the new Test-NetConnection cmdlet, which is really powerful. Consider the PowerShell Test-NetConnection to be a combination of ping, tracert, nslookup, telnet, and a few more debugging tools.
Using Test-NetConnection to Troubleshoot
Let’s have a look at what the Powershell test-netconnection cmdlet can accomplish and how we may utilize it when we’re in the terrible situation of having to troubleshoot a network connectivity issue.
To show you how, I’ll utilize PowerShell Test-NetConnection to debug a frequent, real-world issue: “I can’t go to the XYZ website!”
What most consumers don’t realize is that displaying a website in a browser is an incredible effort in and of itself, given the amount of moving parts that must all operate together. At the very least, the procedure entails:
- Having access to the internet.
- It is necessary to have a route to your DNS server.
- The URL is being resolved by contacting the DNS server.
- Having a path to the IP address where the URL resolves.
- The TCP port 80 is open.
Double-check your internet connection
To get started with troubleshooting, make sure you have an internet connection. Simply execute PowerShell Test-NetConnection with no arguments to do this. If you need additional information, though, I recommend using the InformationLevel option with the Detailed argument.
Detailed Test-NetConnection -InformationLevel
This straightforward operation verifies your local and internet connection, as well as the ability of your DNS client to resolve names aimed at your DNS server, all in one go. Consider it a generic network connection health check. In one command, this script tests three of the five processes required to display a webpage!
Test your connection to the website host using Test-NetConnection.
We’ll have to shift our debugging efforts to the website’s host immediately. As an example, consider Google.com. A remote computer might also be used.
We may use Test-NetConnection with the ComputerName option to confirm that the website host can be resolved in DNS, that a TCP route to the IP address that the name resolves to is accessible, and that it can be pinged all at the same time.
Google.com -ComputerName Test-NetConnection
Despite the fact that this step officially ensures that we have a route to the google.com web server, I’d want to learn more about which routers my packets are passing through on their way to the google.com web server. To do so, I’ll retrieve a list using the TraceRoute argument.
Google.com -ComputerName Test-NetConnection -TraceRoute
Check to see whether your TCP port is open.
Our last check is to make sure the TCP port on which the web server should be executing is open. Because we’re just specifying google.com in this situation, I’m going to presume it’s TCP port 80. We’ll just add another argument to Test-NetConnection to do this. We don’t even need to know the port number since Test-NetConnection recognizes the normal TCP port for a few different services. I can just supply HTTP to the CommonTCPPort argument, and it will take care of the rest.
Google.com -ComputerName Test-NetConnection -CommonTCPPort HTTP
However, if the website is operating on a different port, such as 8080, you may use the Port argument to specify a TCP port explicitly.
Google.com -ComputerName Test-NetConnection -Port 80
Each of the connection criteria stated at the start of this post has now been tested. If we still can’t show the website at this point, we know the issue isn’t with our client, and we can report it to Google or maybe a downstream DNS server.
The “test powershell” is a command-line tool that can be used to test the PowerShell scripting language. It has many features, including the ability to execute scripts and commands on remote systems.
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