香港nginx代理服务器到国内偶尔出现打不开问题？

观察代理服务器日志出现：
2017/09/05 16:51:44 [error] 2337#0: *1097542 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 118.193.207.75, server: www.xtcerjja.com, request: "GET /admin/access/load.ashx?req=http%3A%2F%2Fwww.xtcerjja.com%2Fnews_view.aspx%3FFid%3Dt2%3A5%3A2%26Id%3D408%26TypeId%3D5%26IsActiveTarget%3DTrue&ref=https%3A%2F%2Fwww.google.co.jp%2F&sw=1360&sh=768&cs=-1&_t=0.3023694279318492&ht=http://www.xtcerjja.com&_=1504601447360 HTTP/1.1", upstream: "http://183.67.229.126:80/admin/access/load.ashx?req=http%3A%2F%2Fwww.xtcerjja.com%2Fnews_view.aspx%3FFid%3Dt2%3A5%3A2%26Id%3D408%26TypeId%3D5%26IsActiveTarget%3DTrue&ref=https%3A%2F%2Fwww.google.co.jp%2F&sw=1360&sh=768&cs=-1&_t=0.3023694279318492&ht=http://www.xtcerjja.com&_=1504601447360", host: "www.xtcerjja.com", referrer: "http://www.xtcerjja.com/news_view.aspx?Fid=t2:5:2&Id=408&TypeId=5&IsActiveTarget=True"
链接中有google的域名，是不是因为google跳转到www.xtcerjja.com，导致网站被封，所以打不开，但是一分钟之后又恢复正常。

结构是：用户---香港web反向代理-----国内机房，上面的日志都是在香港代理服务器看到的。谁能解释一下