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Visual Studio 2015 NuGet error–Exception ‘System.AggregateException’ thrown when trying to add source.

After upgrading to the latest NuGet version inside Visual Studio 2015, I couldn’t install any NuGet package anymore. Instead I got the following error message:

Exception ‘System.AggregateException’ thrown when trying to add source ‘http://development/nuget/Default’. Please verify all your online package sources are available.

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The issue is that one of my package sources is a private feed for one of my customers and is not available anywhere else. Before updating to the latest version of NuGet, this didn’t cause any issues. But not so in the latest version Sad smile…

I temporarily deleted the private feed, but a real solution would be welcome!

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