Unable to download files from FTP server

Question

Problem Description: I put a file on FTP server (server created in Windows 10) so clients can download that file. The problem is that clients connected to the Internet with valid IP addresses can download this file, but clients connected to the Internet with dynamic IP addresses cannot download this file. The download operation is performed by a module written in VBA Excel. There is exactly the same problem in executing commands that are sent in the Windows command line. I have attached the image of these instructions. I don't know where the problem is. Please guide me to solve this problem. Thank you. The first image: Command lines were sent by a computer connected to the Internet with a dynamic IP, which eventually encountered an error in downloading the file. Figure 2: Command lines are sent by a computer connected to the Internet with a static IP, which ultimately results in receiving the file.

Answer 1

This should work as a PowerShell replacement for the VB code you posted:

Add-Type -AssemblyName PresentationFramework
Function FtpDownload{
    param(
        [string]$RemoteFile,
        [string]$LocalFile,
        [string]$HostName,
        [string]$User,
        [string]$Pass
    )
    $ftp = "ftp://{0}:{1}@{2}{3}" -f $User,$Pass,$HostName,$RemoteFile
    $uri = New-Object -TypeName System.Uri -ArgumentList $ftp
    $webclient = New-Object -TypeName System.Net.WebClient
    $webclient.DownloadFile($uri, $File)
}

Function DownLoad{
    Try{
        FtpDownload -RemoteFile "/public_ftp/text.txt" `
                    -LocalFile  "D:\town finance/text.txt" `
                    -HostName   "server10.dn-server.com" `
                    -User       "xxxxxx" `
                    -Pass       "nnnnnn"
        [System.Windows.MessageBox]::Show("download ok","Pars Royan","OK","Information") | Out-Null
    }
    Catch{
        [System.Windows.MessageBox]::Show('fail',"Pars Royan","OK","Error") | Out-Null
    }
}

Answer 2

Thank you very much to all friends who took the time to answer my question. My problem was solved with your help.