Verifying that one system can connect to another system via network is a common task for managing applications. A business application that is not interconnected to some other entity is hard to find.

This is a quick way to test some basic network connections on Windows without much dependencies. All you need is PowerShell and .NET which should already be included on most Windows hosts.

Create and start a custom listener (e.g. the server):
PS server> $listener = [System.Net.Sockets.TcpListener]2383
PS server> $listener.Start()

# Verify that ports are opened
PS server> Get-NetTCPConnection -State Listen -LocalPort 2383

LocalAddress                        LocalPort RemoteAddress                       RemotePort State       AppliedSetting OwningProcess
------------                        --------- -------------                       ---------- -----       -------------- -------------                             2383                             0          Listen                     840
Test the connection from a remote system (e.g. the client):
PS client> Test-NetConnection <server> -Port 2383

ComputerName     : server
RemoteAddress    :
RemotePort       : 2383
InterfaceAlias   :
SourceAddress    :
TcpTestSucceeded : True
Stop the listener when you are done:
PS server> $listener.Stop()

# Verify that ports are closed
PS server> Get-NetTCPConnection -State Listen -LocalPort 2383
Get-NetTCPConnection : No matching MSFT_NetTCPConnection objects found by CIM query for instances of the ROOT/StandardCimv2/MSFT_NetTCPConnection class on
the  CIM server: SELECT * FROM MSFT_NetTCPConnection  WHERE ((LocalPort = 2383)) AND ((State = 2)). Verify query parameters and retry.
    + CategoryInfo          : ObjectNotFound: (MSFT_NetTCPConnection:String) [Get-NetTCPConnection], CimJobException
    + FullyQualifiedErrorId : CmdletizationQuery_NotFound,Get-NetTCPConnection