在向谷歌验证sitemap时 提示robots.txt unreachable

Question

这是我的robots地址：http://share.zhbor.com/robots.txt

在谷歌提交时出错提示：
Network unreachable: robots.txt unreachableWe were unable to crawl your Sitemap because we found a robots.txt file at the root of your site but were unable to download it. Please ensure that it is accessible or remove it completely.

具体的截图如下：

没有朋友遇到过这类的问题，我有好几个站点，配置、程序、都是一样的，就是这个http://share.zhbor.com不行，其他的，比如http://cui.zhbor.com http://dw.zhbor.com都是可以的。