(405) Method Not Allowed with Visual Studio 2017 (NuGet) Package Manager

Question

The Error that I get in the Visual Studio Package Manager Output is:

[nuget.org] Unable to load the service index for source https://www.nuget.org/api/v2.
  An error occurred while sending the request.
  The remote server returned an error: (405) Method Not Allowed.

Configuring a proxy in NuGet.config or not configuring a proxy had no effect on the result.

nuget.org in my config is:

<add key="nuget.org" value="https://www.nuget.org/api/v2" />

If I set the environments http_proxy to my companies proxy I can reproduce this using nuget.exe ( NuGet Version: 4.7.0.5148 )

nuget list -source nuget.org -ForceEnglishOutput

Unable to load the service index for source https://www.nuget.org/api/v2.
  An error occurred while sending the request.
  The remote server returned an error: (405) Method Not Allowed.

If I clear the environment http_proxy the same command starts listing packages. (which I abort using crtl+c ).

I know that there is a difference between the package manager in visual studio and nuget.exe.

As I understand both use the same nuget.config file. As I see it somehow the package manager uses a proxy setting that I did not check. I can not find where that would be.

Is there a proxy setting that I did not check? Am I missing something else?

EDIT: When I remove the proxy Settings from Nuget.Config and then update a package source in visual studio my Nuget.Config Settings are rewritten which restores my proxy settings.

Answer 1

Visual Studio kept a copy of the config in memory. Every time the package manager connects it rewrites nuget.config .

So my issue was solved by closing vs2017, editing the nuget.config by hand and restarting visual studio.