Connection Acknowledgement to FTP site: Failure

Import-Module -Name PSFTP

$ftp = "Hostname"

$user = "Username"

$ppass = "password"

$pass = ConvertTo-SecureString $ppass -Force -AsPlainText

$cred = New-Object Management.Automation.PSCredential($user,$pass)

$success = Set-FTPConnection -$Server $ftp -$Credentials $cred -$Session MyTestSession -UsePassive

if ($success -eq $true) { Write-Host "Connection Done" }


{ Write-Host "failed" }

If i manual try to access the files/folder, i can able to establish the connection.

When i try with the PS script, it will throw an error—>

"Set-FTPConnection : A positional parameter cannot be found that accepts argument


At C:\Users\mpradeep\OneDrive - Campus Management Corp\Desktop\pf.ps1:9 char:12

  • $success = Set-FTPConnection -$Server $ftp -$Credentials $cred -$Sess …

  •        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  • CategoryInfo : InvalidArgument: (:slight_smile: [Set-FTPConnection], ParameterBindingException

  • FullyQualifiedErrorId : PositionalParameterNotFound,Set-FTPConnection"


Also, It will give like connection failure or Set-FTPConncection cannot call 0 arguments !!

And if i want to include port value, where should i pass ?

Not sure, that is causing the issue.

Please do help me out.


Have you double checked that line.
The parameter options should not begin with a $.

$success = Set-FTPConnection -$Server $ftp -$Credentials $cred -$Session MyTestSession -UsePassive

Should be:

$success = Set-FTPConnection -Server $ftp -Credentials $cred -Session MyTestSession -UsePassive

If that is the change:

i got this err:

Set-FTPConnection : Exception calling "GetResponse" with "0" argument(s): "The underlying connection was

closed: The server committed a protocol violation."

Well it looks lite it was correct since you got a response this time even though you still have a failure.

Probably easiest to grab the code from the Set-FTPConnection.ps1 file and try it line by line with your information.
Just to see where it fails.

Or use break points if you’re familiar with that in your editor.

Edit: You should probably also check wether SSL is used, self-signed or not and so forth.

Function Set-FTPConnection












[Switch]$EnableSsl = $False,

[Switch]$ignoreCert = $False,

[Switch]$KeepAlive = $False,

[Switch]$UseBinary = $False,

[Switch]$UsePassive = $False,

[String]$Session = "DefaultFTPSession"





if($Credentials -isnot [System.Management.Automation.PSCredential])


$Credentials = Get-Credential $Credentials






if ($pscmdlet.ShouldProcess($Server,"Connect to FTP Server"))


if(!($Server -match "ftp://"))


$Server = "ftp://"+$Server

Write-Debug "Add ftp:// at start: $Server"



Write-Verbose "Create FtpWebRequest object."

[System.Net.FtpWebRequest]$Request = [System.Net.WebRequest]::Create($Server)

$Request.Credentials = $Credentials

$Request.EnableSsl = $EnableSsl

$Request.KeepAlive = $KeepAlive

$Request.UseBinary = $UseBinary

$Request.UsePassive = $UsePassive

$Request | Add-Member -MemberType NoteProperty -Name ignoreCert -Value $ignoreCert

$Request | Add-Member -MemberType NoteProperty -Name Session -Value $Session


$Request.Method = [System.Net.WebRequestMethods+FTP]::ListDirectoryDetails



[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$ignoreCert}

$Response = $Request.GetResponse()



if((Get-Variable -Scope Global -Name $Session -ErrorAction SilentlyContinue) -eq $null)


Write-Verbose "Create global variable: $Session"

New-Variable -Scope Global -Name $Session -Value $Request




Write-Verbose "Set global variable: $Session"

Set-Variable -Scope Global -Name $Session -Value $Request



Return $Response




Write-Error $_.Exception.Message -ErrorAction Stop








Here is my Set-FTPConnection.ps1 file.

Can you check it and let me know is there anything needs to be modify.

Here is the actual requirement,

I wanted to lock/disable the ftp users by passing 5times bogus password or run the script 5times.
Before that,
I want to make sure, whether the connection establishmemt is success or not.
For that i wrote a script, but it failed.Above is the script i used

Err with set-ftpconnection.

Even i cross checked with filezilla,
I can able to connect for it.
If i enter wrong passwd 5times, the acc ll get locked.
Thats what i needed.

If i use psftp single cmdline with correct password, i can able to access for it.

 1..5 | foreach { psftp user@host -pw password } 

If i gave wrong password, it ll ask for prompt to correct password…if i enter wrong password 5 times, acc will get locked.
How to write script for this process !!??

Curious to know, Why are you trying to lock the account ?

Hi Kvprasoon,

Some users don’t want to access for their FTP so for time being we do automate this process by scripting.

Later if they requested, we can enable it on some specific tools.

Do you think this is the right way to do this ? I don’t think so.
If you organization is having a good IT security team, you will be in trouble.

Yes, even i was not aware of this process.

I did checked with network and IT team, they said the procedure to automate this.

They are okay for this.

Hi all, Can anybody help me on this ??

Is there anybody to look into the issue ??

As for this…

"Set-FTPConnection : A positional parameter cannot be found that accepts argument


At C:\Users\mpradeep\OneDrive – Campus Management Corp\Desktop\pf.ps1:9 char:12

  • $success = Set-FTPConnection -$Server $ftp -$Credentials $cred -$Sess …

This is because that is what you are passing it.
$user = "Username"

$ppass = "password" # BTW, never do this. Always prompt for the cred.
                    # If you need to resuse, use secure storage, CLIXML, Credentialmanager, etc...

$pass = ConvertTo-SecureString $ppass -Force -AsPlainText # you are cast as plain text, but this is still securestring
                                                          # and you need a plain text password

$cred = New-Object Management.Automation.PSCredential($user,$pass) # then using a securestring, this is a logic effort
                                                                   # and thus duplicate

# Results

 $user = "Username"


 $ppass = "password"


 $pass = ConvertTo-SecureString $ppass -Force -AsPlainText


 $cred = New-Object Management.Automation.PSCredential($user,$pass)


UserName                     Password
--------                     --------
Username System.Security.SecureString

Just do this

$cred = Get-Credential -Credential 'testuser'


# Resutls

 $cred = Get-Credential -Credential 'testuser'


UserName                      Password
--------                      --------
testuser System.Security.SecureString



Thanks for your reply.

The problem is with set-FTPconnection right ??

And, Where i need to include the script part, which you sent ?