Get past proxy



Keywords: get past proxy
Description: I'm trying to make a request to a website from a .NET client using SSL and I'm struggling to get past the corporate proxy. It keeps giving me 403 Forbidden: Your system policy has denied access to

I'm trying to make a request to a website from a .NET client using SSL and I'm struggling to get past the corporate proxy. It keeps giving me 403 Forbidden: Your system policy has denied access to the requested URL .

Every source on the subject seems to claim that putting <defaultProxy useDefaultCredentials="true" /> in your App.config is the magic bullet for this problem, but it doesn't seem to make a difference here. It seems to me that this would have the same effect as the assignment to WebRequest.DefaultWebProxy.Credentials above, but if I remove the assignment and keep the declaration in App.config I get an error 407: Proxy authentication required instead.

I've taken a look at the actual traffic in Fiddler. Both transactions consist of three messages; the first two result in 407, which I assume is correct. Where IE receives the status 200: Connection established in the last message, my program instead gets 403: Forbidden .

Looking at the contents in detail, the only differences are that IE uses HTTP/1.0 instead of 1.1 and supplies some more information like User-Agent, Content-Length, DNT and Pragma. I would guess that these are unrelated to the problem, and I haven't figured out how to set them anyway.

The behaviour is the same regardless of what URL I try to connect to. If I bypass the proxy server it works.






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