Small Powershell script to check a specific port on host, if that can be accessed. (Old telnet style port check) This can be useful, if you are behind a firewall.

PortCheck.ps1

[CmdletBinding()]
Param(
  [Parameter(Mandatory=$True,Position=1)]
   [string]$hostname,
	
   [Parameter(Mandatory=$True,Position=2)]
   [int]$port
)

try { 
  $tcp=new-object System.Net.Sockets.TcpClient 
  $tcp.ReceiveTimeout=20
  $tcp.SendTimeout=20
  $tcp.connect($hostname,$port) 
  $tcp.close() 
  Write-Host "Connect to "$hostname":"$port "successfull"
} 
catch { 
  "Exception occured" 
  Write-Host "Failed to connect to" $hostname":"$port
}