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

User · Answer

Great answer by mshutov  amp  Salselvaprabu  I needed something a little bit more robust  and that checked all IPAddresses that was provided instead of checking only the first one   I also wanted to replicate some of the parameter names and functionality than the Test-Connection function   This new function allows you to set a Count for the number of retries  and the Delay between each try  Enjoy   function Test-Port         CmdletBinding        Param            string   ComputerName           int   Port           int   Delay   1           int   Count   3            function Test-TcpClient   IPAddress   Port              TcpClient   New-Object Net Sockets TcpClient         Try    TcpClient Connect  IPAddress   Port    Catch             If   TcpClient Connected     TcpClient Close    Return  True           Return  False             function Invoke-Test   ComputerName   Port             Try      array  IPAddress    System Net Dns   GetHostAddresses  ComputerName    Select-Object -Expand IPAddressToString            Catch   Return  False             array  Results    IPAddress       Test-TcpClient -IPAddress    -Port  Port           If   Results -contains  True    Return  True   Else   Return  False               for   i   1    Invoke-Test -ComputerName  ComputerName -Port  Port  -ne  True    i                  if   i -ge  Count                Write-Warning  Timed out while waiting for port  Port to be open on  ComputerName               Return  false                    Write-Warning  Port  Port not open  retrying             Sleep  Delay            Return  true

User · Answer

When scanning closed port it becomes unresponsive for long time  It seems to be quicker when resolving fqdn to ip like    System Net Dns   GetHostAddresses  www msn com   IPAddressToString

User · Answer

Actually Shay levy s answer is almost correct but i got an weird issue as i mentioned in his comment column  So i split the command into two lines and it works fine    Ipaddress  Read-Host  Enter the IP address    Port  Read-host  Enter the port number to access     t   New-Object Net Sockets TcpClient  t Connect  Ipaddress  Port      if  t Connected                 Port  Port is operational            else                Port  Port is closed  You may need to contact your IT team to open it

User · Answer

I improved Salselvaprabu s answer in several ways    It is now a function - you can put in your powershell profile and use anytime you need It can accept host as hostname or as ip address 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

User · Answer

I tried to improve the suggestion from mshutov  I added the option to use the output as an object    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            object    pscustomobject                             Hostname    hostname                         IP    IP                         TCPPort    port                         GetResponse    True           Write-Output  object           else                object    pscustomobject                             Computername    IP                         TCPPort    port                         GetResponse    False           Write-Output  object            Write-Host  msg

User · Answer

If you are using older versions of Powershell where Test-NetConnection isn t available  here is a one-liner for hostname  my hostname  and port  123     t   New-Object System Net Sockets TcpClient  my hostname   123  if  t Connected    OK     Returns OK  or an error message

User · Answer

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

User · Answer

You can check if the Connected property is set to  true and display a friendly message        t   New-Object Net Sockets TcpClient  10 45 23 109   443       if  t Connected                 Port 443 is operational            else

User · Answer

With the latest versions of PowerShell  there is a new cmdlet  Test-NetConnection   This cmdlet lets you  in effect  ping a port  like this   Test-NetConnection -ComputerName  lt remote server gt  -Port nnnn   I know this is an old question  but if you hit this page  as I did  looking for this information  this addition may be helpful

User · Answer

boiled this down to a one liner sets the variable   port389Open  to True or false - its fast and easy to replicate for a list of ports  try  socket   New-Object Net Sockets TcpClient  ipAddress 389  if  socket -eq  null   Port389Open    false else Port389Open    true  socket close    catch Port389Open    false    If you want ot go really crazy you can return the an entire array-   Function StdPorts  ip        rst         select IP Port547Open Port135Open Port3389Open Port389Open Port53Open      rst IP    Ip     try  socket   New-Object Net Sockets TcpClient  ip 389  if  socket -eq  null   rst Port389Open    false else  rst Port389Open    true  socket close    ipscore    catch  rst Port389Open    false      try  socket   New-Object Net Sockets TcpClient  ip 53  if  socket -eq  null   rst Port53Open    false else  rst Port53Open    true  socket close    ipscore    catch  rst Port53Open    false      try  socket   New-Object Net Sockets TcpClient  ip 3389  if  socket -eq  null   rst Port3389Open    false else  rst Port3389Open    true  socket close    ipscore    catch  rst Port3389Open    false      try  socket   New-Object Net Sockets TcpClient  ip 547  if  socket -eq  null   rst Port547Open    false else  rst Port547Open    true  socket close    ipscore    catch  rst Port547Open    false      try  socket   New-Object Net Sockets TcpClient  ip 135  if  socket -eq  null   rst Port135Open    false else  rst Port135Open    true  socket close    SkipWMI    False  ipscore    catch  rst Port135Open    false      Return  rst

[powershell] How to check Network port access and display useful message?

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