Visual Studio Extension Manager Error 417
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With Visual Studio 2012, there is increased importance placed on the Extension Manager component. Not only does it provide a great integrated experience with the Visual Studio gallery for downloading and updating extensions, but it will also be used to deliver updates for Visual Studio itself!
At work, it would constantly fail with error 417 – expectation failed, so working with our facilities team, we were able to identify the problem as an issue with the proxy server we use, Squid.
Squid seems unable to handle the HTTP status code 100, and will then fail with error 417. To solve this, you simply need to add the following to your squid.conf file:
ignore_expect_100 on