How to handle insecure server certificates when httpwebrequest uses SSL connection

Servicepointmanager. servercertificatevalidationcallback attributes
MS-help: // Ms. msdnqtr. v90.chs/fxref_system/html/dcd4157d-dba4-4b60-164a-9e433a045d3c.htm

Remotecertificatevalidationcallback delegate
MS-help: // Ms. msdnqtr. v90.chs/fxref_system/html/b3a0c706-1033-a543-01ca-23d09fcc121a.htm

Webrequest and SSL (the underlying connection was closed. cocould not establish trust relationship with remote server .)
Http://weblogs.asp.net/wim/archive/2004/04/02/106281.aspx

Call ssl vpn WebService in winform
Http://www.cnblogs.com/zhongzf/archive/2006/10/27/386902.html

 

Using system;
Using system. Collections. Generic;
Using system. componentmodel;
Using system. Data;
Using system. drawing;
Using system. LINQ;
Using system. text;
Using system. Windows. forms;

Using system. IO;
Using system. net;
Using system. collections;
Using system. Threading;

Using system. net. Security;
Using system. Security. cryptography. x509certificates;

Namespace getcwdata {
Public partial class form1: FORM {

Cookiecontainer cc;

Public form1 (){
Initializecomponent ();

Begingetdata ();
}

Private void begingetdata (){
This. Cc = new cookiecontainer ();

This.txt username. Text = getcwdata. properties. settings. Default. Username;
This.txt password. Text = getcwdata. properties. settings. Default. Password;
String url = getcwdata. properties. settings. Default. baseurl + getcwdata. properties. settings. Default. loginpage;

// Servicepointmanager. certificatepolicy = new acceptallcertificatepolicy ();
Servicepointmanager. servercertificatevalidationcallback = new remotecertificatevalidationcallback (validateservercertificate );

Httpwebrequest request = (httpwebrequest) webrequest. Create (URL );
Request. method = "Post ";
Request. contenttype = "application/X-WWW-form-urlencoded ";
Request. contentlength = 0;
Request. useragent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; sv1;. Net CLR 2.0.1124 )";
Request. cookiecontainer = This. CC;

Httpwebresponse response = (httpwebresponse) request. getresponse ();

Stream stream = response. getresponsestream ();
Streamreader reader = new streamreader (stream, encoding. utf8 );
String result = reader. readtoend ();

This.txt html. Text = result;
}

// Internal class acceptallcertificatepolicy: icertificatepolicy {
// Public acceptallcertificatepolicy (){
//}

// Public bool checkvalidationresult (servicepoint spoint, x509certificate cert, webrequest wrequest, int certprob ){
/// Always accept
// Return true;
//}
//}

Public static bool validateservercertificate (Object sender, x509certificate certificate, x509chain chain, sslpolicyerrors ){
// If (sslpolicyerrors = sslpolicyerrors. None ){
// Return true;
//}

// Console. writeline ("Certificate error: {0}", sslpolicyerrors );

/// Do not allow this client to communicate with unauthenticated servers.
// Return false;

Return true;
}

}
}