C #. VB. NET using httpwebrequest to access the HTTPS address (SSL)

When you use httpwebrequest to access an SSL address https: // xxxx, error "failed to establish trust relationship for SSL/TLS Security Channel (cocould not establish trust relationship for the SSL/TLS Secure Channel )"

 

 

 

I checked msdn and found a solution. For SSL websites, certificates must be provided during connection. If client certificates are not requiredReturns a security confirmation.You can. However, the implementation of this method is different in. NET 1.1 and. NET 2.0.

Namespace used:

 Using  System  .  Net  ;  Using  System  .  Net  .  Security ;  Using  System  .  Security  .  Authentication  ;  Using  System  .  Security  .  Cryptography  .  X509certificates  ; 

. NET 2.0

Public  Bool  Checkvalidationresult  (  Object  Sender  ,  X509certificate Certificate  ,  X509chain chain  ,  Sslpolicyerrors errors  ){  // Directly confirm, otherwise it cannot be opened  Return  True  ;} Private void  Button#click  (  Object  Sender  ,  Eventargs  E  ){      Servicepointmanager  .  Servercertificatevalidationcallback  =  New  System  .  Net  .  Security  .  Remotecertificatevalidationcallback  (  Checkvalidationresult  );      Httpwebrequest  REQ  = ( Httpwebrequest  )  Webrequest  .  Createdefault  (  New  Uri  (  "Https://zu14.cn /"  ));      REQ  .  Method  =  "Get"  ;      Httpwebresponse  Res  = (  Httpwebresponse  )  REQ  .  Getresponse  ();      //... Normal use, and access common http:  // The address is the same  

}