PowerShell Installing NuGet, says unable to access internet, but I actually can

问题

I followed the steps mentioned in Using PowerShell Behind a Proxy to configure my proxy server.

netsh winhttp set proxy "[IP]:[Port]"
$Wcl = New-Object System.Net.WebClient
$Creds = Get-Credential
$Wcl.Proxy.Credentials = $Creds

A dialog popped up to collect my credential on the third line.

Then I tried to install NuGet:

PS C:\Users\Administrator> Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
WARNING: Unable to download from URI 'https://go.microsoft.com/fwlink/
         ?LinkID=627338&clcid=0x409' to ''.
WARNING: Unable to download the list of available providers. Check your internet
         connection.
Install-PackageProvider : No match was found for the specified search criteria
for the provider 'NuGet'. The package provider requires 'PackageManagement' and
'Provider' tags. Please check if the specified package has the tags.
At line:1 char:1
+ Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (Microsoft.Power...PackageProvider:InstallPackageProvider) [Install-PackageProvider], Exception
    + FullyQualifiedErrorId : NoMatchFoundForProvider,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackageProvider

The error message seems to indicate my PowerShell cannot connect to internet, but when I tried this command:

PS C:\Users\Administrator> Invoke-WebRequest "https://go.microsoft.com/fwlink/?LinkID=627338&clcid=0x409"

StatusCode        : 200
StatusDescription : OK
Content           : &lt;?xml version="1.0" encoding="utf-8"?&gt;
                    &lt;SoftwareIdentity xmlns="http://standards.iso.org/iso/19770/-2/2015/schema.xsd"
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:discovery="http://p...
RawContent        : HTTP/1.1 200 OK
                    Content-MD5: 01uMBNqAHedJsS1dqKC5oA==
                    Vary: Accept-Encoding
                    X-Cache: HIT
                    x-ms-blob-type: BlockBlob
                    x-ms-lease-status: unlocked
                    x-ms-request-id: 1b7af5a7-901e-0003-5d94-f5cc950000...
Forms             : {}
Headers           : {[Content-MD5, 01uMBNqAHedJsS1dqKC5oA==], [Vary, Accept-Encoding], [X-Cache, HIT],
                    [x-ms-blob-type, BlockBlob]...}
Images            : {}
InputFields       : {}
Links             : {}
ParsedHtml        : System.__ComObject
RawContentLength  : 1847

It seems it can connect to the Internet after all.

What did I do wrong? How do I install NuGet?

EDIT: I tried Ocaso Protal's suggestion:

PS C:\Users\Administrator> Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force -proxy [ProxyServer:Port] -proxycredential $Creds
WARNING: Unable to download from URI 'https://go.microsoft.com/fwlink/?LinkID=627338&clcid=0x409' to ''.
WARNING: Unable to download the list of available providers. Check your internet connection.
Install-PackageProvider : No match was found for the specified search criteria for the provider 'NuGet'. The package
provider requires 'PackageManagement' and 'Provider' tags. Please check if the specified package has the tags.
At line:1 char:1
+ Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force  ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (Microsoft.Power...PackageProvider:InstallPackageProvider) [Install-Pac
   kageProvider], Exception
    + FullyQualifiedErrorId : NoMatchFoundForProvider,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPackagePro
   vider

PS C:\Users\Administrator> $Creds

UserName                                   Password
--------                                   --------
[My UserName] System.Security.SecureString

It seems to have no effect.

回答1:

could be TLS security related (ref: https://rnelson0.com/2018/05/17/powershell-in-a-post-tls1-1-world/)

Try this command first:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

then try to do the update. Note: the command only affects the current session and does not persist.

You may also check what version of TLS for client is set on computer. Looks like TLS 1.0 for client is required. (ref: https://powershell.org/forums/topic/wmf-5-1-upgrade-broken-repositories/)

Michael

回答2:

As per https://community.spiceworks.com/topic/2265662-powershell-get-download-problem

I had the same problem today...

My issue was PowerShell Gallery would not download anything on W2016 boxes:

VERBOSE: InstallPackage' - name='AzureRM.BootStrapper',
version='0.5.0',destination='C:\Users\Administrator\AppData\Local\Temp\2\1254134668'
VERBOSE: DownloadPackage' - name='AzureRM.BootStrapper',
version='0.5.0',destination='C:\Users\Administrator\AppData\Local\Temp\2\1254134668\AzureRM.BootStrapper\AzureRM.BootSt
rapper.nupkg', uri='https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0'
VERBOSE: Downloading 'https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0'.
VERBOSE: An error occurred while sending the request.
VERBOSE: Retry downloading 'https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0' for '2' more
times
VERBOSE: An error occurred while sending the request.
VERBOSE: Retry downloading 'https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0' for '1' more
times
VERBOSE: An error occurred while sending the request.
VERBOSE: Retry downloading 'https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0' for '0' more
times
VERBOSE: Downloading package 'AzureRM.BootStrapper' failed, please make sure
'https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0' is accessable.
WARNING: Source Location 'https://www.powershellgallery.com/api/v2/package/AzureRM.BootStrapper/0.5.0' is not valid.
PackageManagement\Install-Package : Package 'AzureRM.BootStrapper' failed to download.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:1772 char:21
+ ...          $null = PackageManagement\Install-Package @PSBoundParameters
+                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (C:\Users\Admini...tStrapper.nupkg:String) [Install-Package], Excep
   tion
    + FullyQualifiedErrorId : PackageFailedInstallOrDownload,Microsoft.PowerShell.PackageManagement.Cmdlets.InstallPac
   kage

What helped me to find out it was TLS v1.2 was this error in Fiddler:

System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception

From there I got this -> A call to SSPI failed, see inner exception - The Local Security Authority cannot be contacted

Then tested locally with:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

Which worked fine!

Hopefully, that will help somebody in the future :-)

You can set it for the whole .NET framework by editing registry:

# Set strong cryptography on 64 bit .Net Framework (version 4 and above)
Set-ItemProperty -Path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NetFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value '1' -Type DWord


# Set strong cryptography on 32 bit .Net Framework (version 4 and above)
Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NetFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value '1' -Type DWord

This happened a few days ago on Windows Server 2016 Datacentre boxes, Win 2019 works fine still.

Commands thanks to: https://johnlouros.com/blog/enabling-strong-cryptography-for-all-dot-net-applications

Happy Azure Stacking!!!

回答3:

Try this:

[System.Net.WebRequest]::DefaultWebProxy.Credentials = System.Net.CredentialCache]::DefaultCredentials

If that doesn't work try this:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

来源：https://stackoverflow.com/questions/55826791/powershell-installing-nuget-says-unable-to-access-internet-but-i-actually-can

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