I know there's an answer for this question from 2016 but it's not working today. I have VS2013 with the latest CU installed.

My Nuget package source settings:[![enter image description here](https://i.stack.imgur.com/sD78U.png)](https://i.stack.imgur.com/sD78U.png)

I want to install the nu-get package "Serilog.Sinks.MSSqlServer". First, I ensure nuget is up to date by navigating to the ".nuget" folder of the solution's folder and running "nuget update -self":

[![enter image description here](https://i.stack.imgur.com/EBQ7I.png)](https://i.stack.imgur.com/EBQ7I.png)

Unfortunately, I still get the error when trying to add the package:
[![enter image description here](https://i.stack.imgur.com/DEH1V.png)](https://i.stack.imgur.com/DEH1V.png)

If I try to update nuget from the "Extensions and Updates" page of VS then I get a 403 error as shown below:[![enter image description here](https://i.stack.imgur.com/IDM7F.png)](https://i.stack.imgur.com/IDM7F.png)

The 403 does suggest a proxy issue but other packages can be installed to the same dev box ok. I just installed "Apache log4net" from the Manage NuGet Packages window - no problem

Any ideas of a work-around for this please?