How to check Network port access and display useful message?

Question

I was trying to check whether the port is opened or not using powershell like follows.

(new-object Net.Sockets.TcpClient).Connect("10.45.23.109", 443) 

This method works , but the output is not user-friendly. It means if there are no errors then it has access. Is there any way to check for success and display some message like " Port 443 is operational"?

Answer 1

If you're running Windows 8/Windows Server 2012 or newer, you can use the Test-NetConnection command in PowerShell.

Ex:

Test-NetConnection -Port 53 -ComputerName LON-DC1 

Answer 2

I improved Salselvaprabu's answer in several ways:

1. It is now a function - you can put in your powershell profile and use anytime you need
2. It can accept host as hostname or as ip address
3. No more exceptions if host or port unavaible - just text

Call it like this:

Test-Port example.com 999 Test-Port 192.168.0.1 80 

---

function Test-Port($hostname, $port) {     # This works no matter in which form we get $host - hostname or ip address     try {         $ip = [System.Net.Dns]::GetHostAddresses($hostname) |              select-object IPAddressToString -expandproperty  IPAddressToString         if($ip.GetType().Name -eq "Object[]")         {             #If we have several ip's for that address, let's take first one             $ip = $ip[0]         }     } catch {         Write-Host "Possibly $hostname is wrong hostname or IP"         return     }     $t = New-Object Net.Sockets.TcpClient     # We use Try\Catch to remove exception info from console if we can't connect     try     {         $t.Connect($ip,$port)     } catch {}      if($t.Connected)     {         $t.Close()         $msg = "Port $port is operational"     }     else     {         $msg = "Port $port on $ip is closed, "         $msg += "You may need to contact your IT team to open it. "                                      }     Write-Host $msg }