C# 语音识别REST API， 在win7上没问题，在win2003 server sp2上出错：

Baidu.Aip.AipException: Failed to request token. The underlying connection was closed: An unexpected error occurred on a send.
at Baidu.Aip.Auth.OpenApiFetchToken(String ak, String sk, Boolean throws)
at Baidu.Aip.Speech.Base.DoAuthorization()
at Baidu.Aip.Speech.Asr.Recognize(Byte[] data, String format, Int32 rate, Dictionary`2 options)
at Baidu.Aip.Demo.SpeechDemo.AsrData(String filename) in G:\Desktop\Visual Studio 2010\Projects\baiduAI\baiduAI\SpeechDemo.cs:line 28