Web Proxy Settings
In this page of ReSharper options, you can adjust Web proxy settings for ReSharper's Internet activities. By default, ReSharper follows your system settings and if any proxy server is defined in your system, ReSharper will use it too for fetching sources from symbol servers, verifying license information, detecting updates, etc.
Use system Web proxy settings when downloading from Internet
You can clear this check box to override system Web proxy settings for ReSharper's Internet connection.
This button appears when you choose to use system proxy server settings.