最近调试原来的微信模拟登陆时发生了“基础连接已关闭，发送时发生错误”的错误提示，原来都是好好的，只是很久没用了。
出错代码如下：
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HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("https://mp.weixin.qq.com/cgi-bin/loginpage?t=wxm2-login&lang=zh_CN");///cgi-bin/loginpage?t=wxm2-login&lang=zh_CN
req.CookieContainer = cookie;
req.Method = "GET";
req.ProtocolVersion = HttpVersion.Version10;
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
StreamReader rd = new
StreamReader(res.GetResponseStream());
string
theContent = rd.ReadToEnd();
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经过一番Google和试验，答案既如此简单，增加如下一句：
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
1 req.CookieContainer = cookie; 2 req.Method = "GET"; 3 req.ProtocolVersion = HttpVersion.Version10; 4 ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3; 5 HttpWebResponse res = (HttpWebResponse)req.GetResponse(); 6 StreamReader rd = new StreamReader(res.GetResponseStream()); 7 string theContent = rd.ReadToEnd();
转自:http://blog.csdn.net/hawksoft/article/details/21776009
(微信API接口开发) 使用HttpWebRequest进行请求时发生错误：基础连接已关闭，发送时发生错误处理,布布扣,bubuko.com