[解決済み] Powershellでギャラリーが利用できないというエラーが発生しました。

質問

モジュールをインストールすることができない問題が発生しました。

PS C:\Users\abc> Register-PSRepository -Name PSGallery -SourceLocation https://www.powershellgallery.com/api/v2
Get-PSGalleryApiAvailability : PowerShell Gallery is currently unavailable.  Please try again later.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:4095 char:9
+         Get-PSGalleryApiAvailability -Repository $Name
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Get-PSGalleryApiAvailability], InvalidOperationException
    + FullyQualifiedErrorId : PowerShellGalleryUnavailable,Get-PSGalleryApiAvailability
 
Register-PSRepository : Use 'Register-PSRepository -Default' to register the PSGallery repository.
At line:1 char:1
+ Register-PSRepository -Name PSGallery -SourceLocation https://www.pow ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (PSGallery:String) [Register-PSRepository], ArgumentException
    + FullyQualifiedErrorId : UseDefaultParameterSetOnRegisterPSRepository,Register-PSRepository
 

PS C:\Users\abc> $PSVersionTable

Name                           Value                                                                                                                                                                 
----                           -----                                                                                                                                                                 
PSVersion                      5.1.17134.858                                                                                                                                                         
PSEdition                      Desktop                                                                                                                                                               
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}                                                                                                                                               
BuildVersion                   10.0.17134.858                                                                                                                                                        
CLRVersion                     4.0.30319.42000                                                                                                                                                       
WSManStackVersion              3.0                                                                                                                                                                   
PSRemotingProtocolVersion      2.3                                                                                                                                                                   
SerializationVersion           1.1.0.1                                                                                                                                                               

-- いくつかのコマンドを追加

Find-PackageProvider -Name nuget
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.
Find-PackageProvider : No match was found for the specified search criteria and package name 'nuget'. Try
Get-PackageSource to see all available registered package sources.
At line:1 char:1
+ Find-PackageProvider -Name nuget
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Microsoft.Power...PackageProvider:FindPackageProvider) [Find-PackagePro
   vider], Exception
    + FullyQualifiedErrorId : NoMatchFoundForCriteria,Microsoft.PowerShell.PackageManagement.Cmdlets.FindPackageProvid
   er

登録はエラーなく完了したようだが、何も追加されない

PS C:\Users\abc> Register-PSRepository -Default
PS C:\Users\abc> Get-PSRepository
WARNING: Unable to find module repositories.
PS C:\Users\abc>

PS C:\Users\abc> [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
PS C:\Users\abc> Register-PSRepository -Name PSGallery -SourceLocation https://www.powershellgallery.com/api/v2
Get-PSGalleryApiAvailability : PowerShell Gallery is currently unavailable.  Please try again later.
At C:\Program Files\WindowsPowerShell\Modules\PowerShellGet\1.0.0.1\PSModule.psm1:4095 char:9
+         Get-PSGalleryApiAvailability -Repository $Name
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Get-PSGalleryApiAvailability], InvalidOperationException
    + FullyQualifiedErrorId : PowerShellGalleryUnavailable,Get-PSGalleryApiAvailability

Register-PSRepository : Use 'Register-PSRepository -Default' to register the PSGallery repository.
At line:1 char:1
+ Register-PSRepository -Name PSGallery -SourceLocation https://www.pow ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (PSGallery:String) [Register-PSRepository], ArgumentException
    + FullyQualifiedErrorId : UseDefaultParameterSetOnRegisterPSRepository,Register-PSRepository

PS C:\Users\abc> Get-PSRepository
WARNING: Unable to find module repositories.

解決方法は？

tls 1.2 を強制してください。これでほとんどのpowershellギャラリーの問題は解決します

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