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POC# Getting proxy settings from Internet Explorer
 

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  1. POC# Getting proxy settings from Internet Explorer
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    <p>i have a problem in certain company in germany. They use proxy in their network and my program cant communicate with server.</p> <p>IE works with this settings:</p> <p><img src="https://i.stack.imgur.com/Vk4nu.gif" alt="Their settings"></p> <p>It means: Automatically detect settings</p> <p>This is the code:</p> <pre><code>public static bool CompleteValidation(string regKey) { string uri = "***"; int c = 1; if (Counter &lt; 5) c = 6 - Counter; string response = ""; try { System.Net.ServicePointManager.Expect100Continue = false; HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri); request.AllowWriteStreamBuffering = true; request.Method = "POST"; request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0"; request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; request.Headers.Add(HttpRequestHeader.AcceptLanguage, "pl,en-us;q=0.7,en;q=0.3"); request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate"); request.Headers.Add(HttpRequestHeader.AcceptCharset, "ISO-8859-2,utf-8;q=0.7,*;q=0.7"); request.KeepAlive = true; //proxy settings string exepath = Path.GetDirectoryName(Application.ExecutablePath); string proxySettings = exepath + @"\proxy.ini"; WebProxy wp = new WebProxy(); if (File.Exists(proxySettings)) { request.Proxy = WebRequest.DefaultWebProxy; IniFile ini = new IniFile(proxySettings); string user = ini.IniReadValue("Proxy", "User"); string pass = ini.IniReadValue("Proxy", "Password"); string domain = ini.IniReadValue("Proxy", "Domain"); string ip = ini.IniReadValue("Proxy", "IP"); string port_s = ini.IniReadValue("Proxy", "Port"); int port = 0; if (!string.IsNullOrEmpty(ip)) { if (!string.IsNullOrEmpty(port_s)) { try { port = Convert.ToInt32(port_s); } catch (Exception e) { ErrorLog.AddToLog("Problem with conversion of port:"); ErrorLog.AddToLog(e.Message); ErrorLog.ShowLogWindow(); } wp = new WebProxy(ip, port); } else { wp = new WebProxy(ip); } } if (string.IsNullOrEmpty(domain)) wp.Credentials = new NetworkCredential(user, pass); else wp.Credentials = new NetworkCredential(user, pass, domain); request.Proxy = wp; } string post = "***"; request.ContentLength = post.Length; request.ContentType = "application/x-www-form-urlencoded"; StreamWriter writer = null; try { writer = new StreamWriter(request.GetRequestStream()); // Here is the WebException thrown writer.Write(post); writer.Close(); } catch (Exception e) { ErrorLog.AddToLog("Problem with request sending:"); ErrorLog.AddToLog(e.Message); ErrorLog.ShowLogWindow(); } HttpWebResponse Response = null; try { Response = (HttpWebResponse)request.GetResponse(); } catch (Exception e) { ErrorLog.AddToLog("Problem with response:"); ErrorLog.AddToLog(e.Message); ErrorLog.ShowLogWindow(); } //Request.Proxy = WebProxy.GetDefaultProxy(); //Request.Proxy.Credentials = CredentialCache.DefaultCredentials; string sResponseHeader = Response.ContentEncoding; // get response header if (!string.IsNullOrEmpty(sResponseHeader)) { if (sResponseHeader.ToLower().Contains("gzip")) { byte[] b = DecompressGzip(Response.GetResponseStream()); response = System.Text.Encoding.GetEncoding(Response.ContentEncoding).GetString(b); } else if (sResponseHeader.ToLower().Contains("deflate")) { byte[] b = DecompressDeflate(Response.GetResponseStream()); response = System.Text.Encoding.GetEncoding(Response.ContentEncoding).GetString(b); } } // uncompressed, standard response else { StreamReader ResponseReader = new StreamReader(Response.GetResponseStream()); response = ResponseReader.ReadToEnd(); ResponseReader.Close(); } } catch (Exception e) { ErrorLog.AddToLog("Problem with comunication:"); ErrorLog.AddToLog(e.Message); ErrorLog.ShowLogWindow(); } if (response == "***") { SaveKeyFiles(); WriteRegKey(regKey); RenewCounter(); return true; } else { return false; } } </code></pre> <p>My program logs it as:</p> <pre><code>[09:13:18] Searching for hardware ID [09:13:56] Problem with response: [09:13:56] The remote server returned an error: (407) Proxy Authentication Required. [09:15:04] problem with comunication: [09:15:04] Object reference not set to an object instance. </code></pre> <p>If they write user and pass into proxy.ini file, program works. But the problem is they cant do that. And somehow IE works without it. Is there any way to get those settings from IE or system?</p>
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    1. COFirst of all, in the catch (Exception e) get rid of e.message and just log e. This way you get a stack trace and you can figure out what object is null.
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    2. COttymatty: its still not complete code but the problem is earlier than `Object reference not set to an object instance.` Look at `The remote server returned an error: (407)` when trying to `Response = (HttpWebResponse)request.GetResponse();`. Response is null because it wasnt authorized.
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