The remote server returned an error 407 Proxy Authentication Required

Question

I m getting this error when I call a web service    The remote server returned an error   407  Proxy Authentication Required    I get the general idea and I can get the code to work by adding  myProxy Credentials   NetworkCredential  user    password    domain      or by using DefaultCredentials in code   My problem is that the call to the web service works in production without this   It seems like there is a non code solution involving Machine config  but what is it   At the moment I can t get to the production box s machine config file to see what that looks like   I tried updating my machine config as follows  but I still get the 407 error      lt system net gt       lt defaultProxy enabled  true  useDefaultCredentials  true  gt           lt bypasslist gt               lt clear   gt           lt  bypasslist gt           lt proxy proxyaddress  myproxy 9000                 usesystemdefault  false                 bypassonlocal  true                 autoDetect  False    gt       lt  defaultProxy gt   lt  system net gt

User · Answer

Thought of writing this answer as nothing worked from above & you don't want to specify proxy location.

If you're using httpClient then consider this.

HttpClientHandler handler = new HttpClientHandler();

IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = CredentialCache.DefaultCredentials;
handler.Proxy = proxy;

var client = new HttpClient(handler);
// your next steps...

And if you're using HttpWebRequest:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri + _endpoint);

IWebProxy proxy = WebRequest.GetSystemWebProxy();
proxy.Credentials = CredentialCache.DefaultCredentials;
request.Proxy = proxy;

Kind referencce: https://medium.com/@siriphonnot/the-remote-server-returned-an-error-407-proxy-authentication-required-86ae489e401b

User · Answer

I had a similar proxy related problem  In my case it was enough to add   webRequest Proxy Credentials   new NetworkCredential  user    password    domain

User · Answer

HttpWebRequest webRequest   WebRequest Create uirTradeStream  as HttpWebRequest   webRequest Proxy   WebRequest DefaultWebProxy   webRequest Credentials   new NetworkCredential  user    password     webRequest Proxy Credentials   new NetworkCredential  user    password      It is successful

User · Answer

Probably the machine or web config in prod has the settings in the configuration  you probably won t need the proxy tag    lt system net gt       lt defaultProxy useDefaultCredentials  true   gt           lt proxy usesystemdefault  False                 proxyaddress  http    lt ProxyLocation gt   lt port gt                  bypassonlocal  True                 autoDetect  False    gt       lt  defaultProxy gt   lt  system net gt

User · Answer

In following code  we don t need to hard code the credentials   service Proxy   WebRequest DefaultWebProxy  service Credentials   System Net CredentialCache DefaultCredentials    service Proxy Credentials   System Net CredentialCache DefaultCredentials

User · Answer

Check with your firewall expert   They open the firewall for PROD servers so there is no need to use the Proxy   Thanks your tip helped me solve my problem   Had to to set the Credentials in two locations to get past the 407 error   HttpWebRequest webRequest   WebRequest Create uirTradeStream  as HttpWebRequest  webRequest Proxy   WebRequest DefaultWebProxy  webRequest Credentials   new NetworkCredential  user    password    domain    webRequest Proxy Credentials   new NetworkCredential  user    password    domain      and voila

User · Answer

Just add this to config    lt system net gt       lt defaultProxy useDefaultCredentials  true   gt       lt  defaultProxy gt   lt  system net gt

[c#] The remote server returned an error: (407) Proxy Authentication Required

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