By default, if you only access the Internet from your computer via a proxy server, you cannot access external web resources from a PowerShell session: the web page, the Update Help command, connecting to Office365/Azure, or downloading an application from a remote repository . In this article we will show you how to access the internet from a PowerShell session via an authenticated proxy server.

Let’s try updating the PowerShell Help from a computer behind the proxy:

Update help

Or call an external website:

Invoke-WebRequest http://contoso.com
If you do not have a direct connection to the Internet, the command returns a similar error:

Update – Help : The help for the DhcpServer module(s), DirectAccessClientComponents…. with {in-US} user interface culture(s) could not be updated : No links can be made to the contents of the help. The server on which the reference material is stored may not be available. Make sure the server is available or wait until the server is back online and try the Invoke-WebRequest command again: It is not possible to connect to the remote server.

Nullity: (System.Net.HttpWebRequest:HttpWebRequest).

The fact is that PowerShell (especially the .NET System.Net.WebClient class that uses these commands to access external resources via HTTP/HTTPS) does not use the proxy settings set by Internet Explorer. However, the WebClient class has certain properties that make it possible to specify both the proxy settings (WebClient.Proxy) and the authentication data of the proxy (WebClient.Credentials or WebClient.UseDefaultCredentials). Let’s see how to use these WebClient class features.

Manage WinHTTP proxy settings for PowerShell

Let’s check the current system proxy settings via PowerShell :

show the winhttp proxy network

As you can see, the proxy settings are not specified:

Current WinHTTP proxy settings:
Direct access (no proxy server).

You can import the proxy server settings from the Internet Explorer settings:

netsh winhttp import proxy source=it

or set it manually:

netsh winhttp set proxy 192.168.0.14:3128

 

If proxy authentication is required, an error such as (407) Proxy authentication required is displayed when attempting to execute PowerShell commands. If you z. B. Try logging in to your Azure subscription with the command :

Add-AzureAccount – Credit (Get-Credential)

There’s been a mistake:

Add-AzureAccount : user_realm_discovery_failed : Detection of the user space failed: The remote server returned an error: (407) Proxy authentication is required.

How do I configure proxy authentication with PowerShell?

Let’s look at two ways to use proxy authentication: You can use Active Directory SSO authentication, or you can specify user data for manual authentication.

If you are logged in to your computer under a domain account and your proxy server supports Active Directory Kerberos or NTLM authentication (if you have not yet disabled it), you can use your current user information to authenticate to the proxy server (you do not need to enter your user name and password):

Wcl = new object System.Net.WebClient
$Wcl.Headers.Add (user agent, PowerShell Script)
$Wcl.Proxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials

If you need to authenticate manually on the proxy server, execute the following commands and enter your username and password in the appropriate authentication window.

$Wcl=New Object System.Net.WebClient
$Cred=Get-Credentials
$Wcl.Proxy.Credentials=$Cred.

 

You can now try to open the remote site or update the help with the Update Help command.

Na

As you can see, the Invoke-Web Request command returns the data from the external web page of the site!

Setting proxy settings in the PowerShellprofile file

You can create a PowerShell profile file to automatically set the proxy settings when PowerShell is launched.

To do this, execute a command that creates a PowerShell profile file (C:UsersusernameDocumentsWindowsPowerShellMicrosoft.PowerShell_profile.ps1) :

Notepad $PROFILE (or Notepad $PROFILE.AllUsersCurrentHost – if you need to apply a PowerShell profile to all users on the computer). A PowerShell profile is a PS script that is executed when you run the PowerShell.exe process.

Copy the PowerShell code to a notebook window. You’re using z. B. PAC (Proxy Auto Configuration) files to automatically configure proxy settings on users’ computers. Use the following PowerShell profile script to specify the URL of the PAC file and authenticate it as the current user on the proxy server.

system.net.webrequest]::DefaultWebProxy = new-object system.net.webproxy(‘http://10.1.15.5:80’)
# If you need to import the proxy settings from Internet Explorer, you can replace the previous line with: netsh winhttp import proxy source=ie
[system.net.webrequest]::DefaultWebProxy.credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
# You can request user data :
# System.Net.WebRequest]::DefaultWebProxy.Credentials = Get-Credential
# You can also retrieve the user’s password from a saved XML file (see Using saved credentials in PowerShell scripts) :
# System.Net.WebRequest]::DefaultWebProxy= Import-Clixml – Path C:PSuser_creds.xml
[system.net.webrequest]::DefaultWebProxy.BypassProxyOnLocal= $true

By default, the PowerShell Script Execution Policy does not allow all PS scripts to be executed even from within the PowerShell profile files. To run scripts, you must change PowerShell’s execution policy. Execute the command:

Remote Execution Policy

Save the Microsoft.PowerShell_profile.ps1 file and restart the PowerShell console window. Now make sure you can access web resources from a PowerShell session through the proxy server without having to run additional commands.

Check the current proxy settings via PowerShell

You can remove the current proxy settings from the registry using the PowerShell command:

GetProperty – ‘HKCU:SoftwareMicrosoftWindowsCurrentVersionInternet Setup’ path | Select-Object ProxyServer, ProxyEnable

In my example, this is the address and port of the proxy server: 192.168.1.100:3128
Proxy server enabled : ProxyEnable =1

 

You can also get these WebProxy settings:

System.Net.WebProxy]::GetDefaultProxy()

 

If necessary, you can activate the use of a proxy server with the following command:

Set-ItemProperty – ‘HKCU:SoftwareMicrosoftWindowsCurrentVersionInternet Setup’ ProxyEnable – value 1

To deactivate the proxy :
Set-ItemProperty – ‘HKCU:SoftwareMicrosoftWindowsCurrentVersionInternet Setup’ ProxyEnable – value 0

Setting up a Windows proxy with PowerShell?

You can use PowerShell to define proxy settings for the current Windows user. For example, the following PowerShell function allows you to change proxy settings, but first test the availability of the proxy server and its port response using the Test-NetConnection cmdlet

Set-Proxy ( $server,$port) function
{
If ((Test-NetConnection -ComputerName $server -Port $port).TcpTestSucceded) {
Set-ItemProperty -Path ‘HKCU:SoftwareMicrosoftWindowsCurrentVersionInternet Settings’ -name ProxyServer -Value $($server):$($port)
Set-ItemProperty -Path ‘HKCU:SoftwareMicrosoftWindowsCurrentVersionInternet Settings’ -name ProxyEnable -Value 1
}.
Total {
spelling error – message Invalid proxy address or port: $($server):$($port)
}
}

Adoption of the power of attorney 192,168,1,100 3128

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