Cause: The SSLv2 protocol has been disabled by default in WININET.
原因：WININET默认关闭了SSLv2协议。
2
Cause: Performance improvements and support for the OCSP protocol were made to Windows Vista, enabling WININET to improve security by enabling revocation checking by default.
Once the calls through the Wininet library have established a secure connection to the server end, the Visual Basic client application would make the appropriate SOAP calls to send data.