如何在Webservice中使用HttpWebRequest检测受信任的站点？

Question

I have a console application for the 2.0 framework in C#, using vs 2005. This is weird, the exact same code I have worked on both my pc and the server(using webservice).

When I execute HttpWebRequest.GetResponse on URL, First one(pc) works well but last one(webservice) returns an error :

 (404) Not Found. The URL is a trusted site. Internet sites and local intranet sites are detected successfully. But trusted sites only could not be detected. 

I don't know why?

This is the code:

 private bool getSiteConnStatus(string url) { bool result = true; Uri uri = new Uri(url); try { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); WebProxy SCProxy = new WebProxy("123.123.123.123"); SCProxy.Credentials = new NetworkCredential(); request.Proxy = SCProxy; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if (response == null || response.StatusCode != HttpStatusCode.OK) { result = false; } response.Close(); } catch (Exception ex) { result = false; } return result; } 

~~~~~~~~~~

I've solved.

The Proxy information was changed whenever each site called. So I added some lines below. Reference site

 private bool getSiteConnStatus(string url)
    {
        bool result = true;
        Uri uri = new Uri(url);
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
            ***WebProxy SCProxy;
            if (request.Address.Host == "test.net")
            {
                SCProxy = new WebProxy("111.111.111.111", 8080);
            }
            else
            {
                SCProxy = new WebProxy("123.123.123.123", true);
            }
            request.Proxy = SCProxy;***

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            if (response == null || response.StatusCode != HttpStatusCode.OK)
            {
                result = false;
            }
            response.Close();
        }
        catch (Exception ex)
        {
            result = false;
        }
        return result;
    }

Answer 1

Try Accessing your url from Browser (on-server) - If it works your browser agent is configured to make communication to/from given ports to the outside world.

Check your firewall policies and any specific user-agent strings they are preventing to make connections to the out-side world ?

Also verify your Proxy Authentication , if you try it from the browser (i presume here its IE ) . browser might supply it automatically / NTLM Authentication strings. where your program might not be able to ?