WCF：远程服务器返回错误：“（417）预期失败”和“（503）服务器不可用”

Question

First of all, I've tried a lot in google and statckoverflow, but it still fails. I hope to help me. Thank you.

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I am getting the following error when call an WCF Service from my WebClient.

The remote server returned an error: (417) Expectation Failed .

I have tried changing web.config of my WebClient, with the following settings, but still no success.

<system.net>
    <settings> 
        <servicepointmanager expect100continue="false" />
    </settings>
</system.net>

Following this change, I'm getting the error:

The remote server returned an error: (503) Server Unavailable .

Note 1: Through the WCF Test Client or another console client works fine. Why??

Note 2: Server and Web Client hosted in IIS.

Answer 1

The error occurred because the setting of a duplicate binding on IIS Site.

After remove it, works fine.