[error] [exception.WxPayException] exception 'WxPayException' with message 'curl出错，错误码:6'

最后定位到接口 https://api.mch.weixin.qq.com/pay/orderquery ，curl post参数过去无响应，是微信支付服务器出问题吗？这问题太蛋疼了，导致用户支付了，支付回写验证失败

 2015/07/11 20:47:53 [error] [exception.WxPayException] exception 'WxPayException' with message 'curl出错，错误码:6' in protected/vendors/WxpayAPI_php_v3/lib/WxPay.Api.php:548
Stack trace:
#0 protected/vendors/WxpayAPI_php_v3/lib/WxPay.Api.php(55): WxPayApi::postXmlCurl('<xml><appid><![...', 'https://api.mch...', false, 10)
#1 protected/service/Test.php(151): WxPayApi::unifiedOrder(Object(WxPayUnifiedOrder))
#2 protected/modules/pay/controllers/OrderController.php(51): Test::weixinRequestV3(7800, '143661853975030...', '1J2tmoWHryHzY8D...')
#3 /web/actions/CInlineAction.php(49): OrderController->actionOrder()
#4 /web/CController.php(308): CInlineAction->runWithParams(Array)
#5 /web/CController.php(286): CController->runAction(Object(CInlineAction))
#6 /web/CController.php(265): CController->runActionWithFilters(Object(CInlineAction), Array)
#7 /web/CWebApplication.php(282): CController->run('order')
#8 /web/CWebApplication.php(141): CWebApplication->runController('order')
#9 /base/CApplication.php(180): CWebApplication->processRequest()
#10 index.php(33): CApplication->run()