Visual Studio 2013 Update 4 - Tools and Extensions Not reaching the internet

问题

I've just updated Visual Studio 2013 with Update 4, and my tools and extensions manager isn't able to connect to the internet.

回答1:

So, I thought I would post my solution to this annoying problem. My proxy settings for access behind my company's firewall had been removed with the update.

Go here: C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE find this file devenv.exe.config

edit system.net to include this:

<system.net>
    <defaultProxy useDefaultCredentials="true" enabled="true">
    <proxy proxyaddress="http://yourproxy:8080" />
</defaultProxy>
<settings>
    <servicePointManager expect100Continue="false" />
    <ipv6 enabled="true" />
</settings>
</system.net>

Note that you'll need to edit this in a text program that you run with admin permissions.

来源：https://stackoverflow.com/questions/26913457/visual-studio-2013-update-4-tools-and-extensions-not-reaching-the-internet