采用AsyncRestTemplate异步推送模板消息时请求

https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=

当并发量大（qps>200）时会报：

javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake

connection time out等网络错误。请教一下大牛们，问题出在那里呢？