xshell打开GUI程序失败
xshell中执行GUI程序时会自动运行Xmanager，并在客户端机器显示GUI程序的图形界面。但使用su - xiao切换用户后，执行GUI程序报错：Connection lost to X server `localhost:10.0'；xshell直接登录用户xiao则能够正常显示。查看环境变量DISPLAY，两种情况下都是localhost:10.0。
新建文件 /root/.xauth/export，内容为用户名xiao，问题解决。
问题解析：
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The message above is received when X application fails to connect to PC X server, Xmanager.
The common reasons that may cause connection failure to PC X server are the following:
1. PC X server is not installed: After installing Xmanager, set "Forward X11 connections to Xmanager"(Properties -> Tunneling -> X11 Forwarding).
2. When switched to a different user using su command, X11 authentication cookie cannot be accessed.
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The authority is propagated. Once you switch user to root s broken and you must manually create the xauthority. This behaviour is controlled by pam_xauth, and apparently you can make it automatic for root to forward the xauth key to a user by creating a file /root/.xauth/export and adding the allowed users to it, see
http://www.kernel.org/pub/linux/libs...pam_xauth.html
参考：
http://www.netsarang.com/bbs/detail.html?id=xshell&num=151