c# - HTTP request error from framework 4 application -

i try use webservice .net application (.net framework 4, c#, vs 2010) , got exception:

an error occurred while making http request https://... due fact server certificate not configured http.sys in https case. caused mismatch of security binding between client , server.

:

does know how fix code?

  servicepointmanager.securityprotocol = securityprotocoltype.tls | securityprotocoltype.ssl3;