VS 2013 The remote server returned an error: (407) Proxy Authentication Required

Question

First, I tried everything in The remote server returned an error: (407) Proxy Authentication Required The remote server returned error: (407) Proxy Authentication Required and similar pages, but to no avail - changed App.config, devenv.exe.config and mtm.exe.config. Proxy settings are in IE. I get this error during build trying to build microsoft prism StockTraderRI_Desktop example. MS Server 2012 R2 Standard.

Answer 1

After serveral days struggle, I accidentally clicked Output tab (instead of Error List), where I saw that message was from Nuget trying to do stuff during build time. So I googled Nuget 407 and tried this solution https://stackoverflow.com/a/36404624/3423333 And it worked finally. Not sure if my previous manipulations has any effects with this.