NuGet Unable to load the service index for source Authentication failed

Question

Since today for some reason I'm unable to connect to the NuGet package manager through Visual Studio.

[nuget.org] Unable to load the service index for source https://api.nuget.org/v3/index.json.
  An error occurred while sending the request.
  The underlying connection was closed: An unexpected error occurred on a send.
  Authentication failed because the remote party has closed the transport stream.

But I cannot get it to work again... Things I tried.

Delete NuGet.config
Clear NuGet cache
Disable TLS1.0 and TLS1.1 explicitly
Enabled TLS1.2 explicitly
followed the manual from nuget at https://devblogs.microsoft.com/nuget/deprecating-tls-1-0-and-1-1-on-nuget-org/
Different Visual Studios
Update to the latest Visual Studio 2019
Tried different TLS settings in the RegEdit for 1.0, 1.1 and 1.2. I don't have a TLS1.3 section yet.
I can browse to https://api.nuget.org/v3/index.json with chrome

TLS1.2 Client settings:

TLS1.2 Server settings:

Specs: Windows Server 2012R2, Visual Studio 2019

Also tried it on a different Windows Server 2012R2 machine and same problem

It is still working on my laptop with Windows 10.

Hopefully someone has an idea.

Thanks

score 6 · Answer 1 · edited Mar 18 '23 at 13:37

6

I had the same problem.

The solution was to install the microsoft/artifacts-credprovider as mentioned on that page.

Invoke-Expression "& { $(irm https://aka.ms/install-artifacts-credprovider.ps1) } -AddNetfx"

edited Mar 18 '23 at 13:37

Ryan Griffith

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answered Oct 17 '22 at 08:31

R00st3r

954
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This solved my issues with restoring packages from an internal NuGet repository hosted on Azure from the CLI (which would fail even though VS22' restored without issue). – zcoop98 Apr 11 '23 at 16:57

score 3 · Accepted Answer · answered May 17 '22 at 12:09

Had exactly the same problem, running script from https://github.com/microsoft/azure-devops-tls12 and following instructions from it helped me. In my case it generated additional script file, after running that and restaring pc nuget was working once again.

score 0 · Answer 3 · edited Apr 08 '23 at 02:50

one of the classic reason...

Possible Problem: Stale Artifactory Credentials in Credential Manager You have saved credentials for your artifactory in credential manager. If your system/SSO credentials changed recently then this will happen.

Solution: Update/Remove Saved credentials from Credentials Manager Go to Windows => Credentials manager => Windows Credentials => Generic Credentials => [Artifactory related Credentials] => Remove.

When you rebuild from visual studio it will again ask for fresh credentials. It's upto you whether want to save or add every time.

Credential manager - []

Enter credentials after rebuild in VS []

NuGet Unable to load the service index for source Authentication failed

3 Answers3

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