微信公众平台获取用户信息报错

The remote certificate is invalid according to the validation procedure. 想问下大神们这个错误怎么解决啊。。。
Response.Redirect("https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appid + "&redirect_uri=http://fan249.jinjuzhi.com/AdminList/wxProcess2.aspx?reurl=" + reurl + "&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect");

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