An error occurred while communicating with the remote host. The error code is 0x80070016

Dear Indedo,

Allrecipes has a mirror of NuGet.org in our ProGet (4.6.7, build 2) instance. We’ve enabled the (nuget.org v3) feed connector for our mirror feed. Afterward, viewing the feed displays the following error message prominently:
There was an error with a connector: Data at the root level is invalid. Line 1, position 1.

We see warning messages similar to the following for the feed In the ProGet error log:
An error occurred processing a GET request to http://INTERNALSERVERURL/nuget/nugetmirror/package/HtmlAgilityPack/1.4.6: An error occurred while communicating with the remote host. The error code is 0x80070016.

Inedo frequently put off support for NuGet v3 support according to their forums. It’s Allrecipes understanding that this functionality is definitely now included and supported in ProGet.

We’ve had to disable internal ProGet usage for .NET Core applications every time a new .NET Core framework is released so our build agents can populate local NuGet caches. This takes a considerable amount of developer time.

Product: ProGet
Version: 4.6.7

Just to clarify... the "NuGet v3 API" is intended for internal-use (i.e. only nuget.exe and NuGet VS extension). Microsoft's new position is that they do not intend on making this API public or stable in the foreseeable future, and that they will continue to support the "NuGet v2 API" (which is documented and public) indefinitely. They actually use ProGet to test changes to v2 API.

That said, until this position changes, we will not reverse-engineer the v3 protocol. So this means you will need to use nuget.org/api/v2 in your connector, not the v3 url.

Both v2 and v3 API work with client tools, both support DotNetCore, etc. If you're finding a issues with DNC projects, then it's likely related to framework monikers or something like that. Please submit a ticket for this with specifics, so we can investigate and patch.