HTTP status 407: Proxy authentication required Error when calling web service

authentication, c#, proxy, web-services

Solution

Popping a`<defaultProxy />` element into in app.config / web.config under `<system.net>` with `useDefaultCredentials="true"` may well do the job.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.net>
    <defaultProxy useDefaultCredentials="true" />
  </system.net>
</configuration>

Problem

I have spent two hours on this error "HTTP status 407: Proxy authentication required Error " when calling a web service, my code is like following ``` WebProxy oWebProxy = new System.Net.WebProxy(ProxyServer, ProxyPort); oWebProxy.Credentials = new NetworkCredential(ProxyUser,ProxyPassword,ProxyDomain); oserv.Proxy = oWebProxy; oserv.Credentials = new NetworkCredential(theusername, thepassword); ``` I have verified that the proxy address, user id password are all correct, and I could access the web service thru the IE in same pc, but when I run the code with VS, the error keeps popup. I have tried the `UserDefaultCredentials=true` as well, but no luck. Any idea?

Original source