how to fix DownloadFile error in powershell in windows10 [closed] - powershell

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I ran cmd as administrator and input:
start powershell
when open the powershell, I input:
$client = new-object System.Net.WebClient
$client.DownloadFile("https://www.cse.ust.hk/msbd5003/data/fruits.txt","D:\IT\fruits.txt")
here is the error information:
Exception calling "DownloadFile" with "2" argument(s): "The underlying connection was closed: An unexpected error occurred on a send."
At line:1 char:1
+ $client.DownloadFile("https://www.cse.ust.hk/msbd5003/data/fruits.txt ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : WebException
I tried adding $ client.Credentials = Get-Credential while it did not work.

Answer 1

My guess would be that since you're connecting through https you may need to set a more secure schannel protocol to communicate with the site you're trying to download from.
add this line indicating security protocol before your webclient request
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$client = new-object System.Net.WebClient
$client.DownloadFile("https://www.cse.ust.hk/msbd5003/data/fruits.txt","D:\IT\fruits.txt")
Alternately, if you are only running this script from one machine, you can set .NET to use secure protocols by default.
You can read more about it at https://learn.microsoft.com/en-us/dotnet/framework/network-programming/tls
Key - HKEY_LOCAL_MACHINE\SOFTWARE\[Wow6432Node\]Microsoft\.NETFramework\<VERSION>
Name - SchUseStrongCrypto
Value - 1
Also, the native PowerShell cmdlet invoke-webrequest may simplify your request.
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Invoke-WebRequest -Uri "https://www.cse.ust.hk/msbd5003/data/fruits.txt" -OutFile "D:\IT\fruits.txt"