How should I set the default proxy to use default credentials?

.net proxy
Brian Genisio picture Brian Genisio · Nov 18, 2008 · Viewed 124.2k times · Source

The following code works for me:

var webProxy = WebProxy.GetDefaultProxy();
webProxy.UseDefaultCredentials = true;
WebRequest.DefaultWebProxy = webProxy;

Unfortunately, WebProxy.GetDefaultProxy() is deprecated. What else should I be doing?

(using app.config to set the defaultProxy settings is not allowed in my deployment)

Answer

Andrew Webb picture Andrew Webb · Nov 18, 2011

For those who, unlike Brian Genisio, are able to set the contents of their application's config file:- don't do anything in code. Instead add this to your app.config / web.config.

<system.net>
  <defaultProxy useDefaultCredentials="true" />
</system.net>

Really and truly the default for using the default credentials should be "true"; I've seen this issue confuse so many people - developers, users, IT guys.

For more info see here:- http://sticklebackplastic.com/post/2007/01/26/Poxy-proxies.aspx

UPDATE: I've created this issue/idea for Microsoft to change the default of useDefaultCredentials from false to true so that this whole problem goes away and .NET apps "just work"; please vote it up if you agree:
http://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/2397357-fix-it-so-that-net-apps-can-access-http-thru-auth

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