nginx代理为什么ip能正常访问而域名就不行呢？

[sujin190]

使用ip可以正常访问，使用域名访问access日志中已经打印出200了
[07/Sep/2013:15:59:26 +0800] "GET / HTTP/1.1" 200 0 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.62 Safari/537.36" "-"

但error日志中却出现了这个
2013/09/07 15:59:26 [info] 31885#0: *267 writev() failed (104: Connection reset by peer) while sending to client, client: 115.183.186.103, server: xxx.xxxx.xx, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "xxx.xxxx.xx"
页面也没有显示出来，这是为什么啊？

[mongodb]

104: Connection reset by peer

1 GFW
2 机房白名单