：Xlib: No protocol sp…

原文地址：转载：Xlib:<wbr>No<wbr>protocol<wbr>specified</wbr></wbr></wbr> 作者：很容易

我在linux下访问db2cc，出现Xlib: No protocol specified的错误

转自 http://blog.sina.com.cn/s/blog_66719ff30100sdib.html

设置xhost +允许所有的服务器使用当前的X Server，默认情况下，其他服务器是无法访问本机的X Server，这时如果执行需要图形化显示的命令，就会导致上面的Xlib: connection to "172.25.198.226:1.0" refused by server的错误。

root用户下执行#xhost +

看到如下显示： access control disabled, clients can connect from any host

另，我还按照 http://blog.sina.com.cn/s/blog_4d6e44860100lyo2.html 的说法操作了一次，但当时没有成功。
但是确实设置了一下环境变量。不知道这个环境变量是否有影响。关键步骤还是“ root用户下执行#xhost + ”

出现错误提示：“Xlib: connection to ":1.0" refused by server”

如下处理：

实用技巧：在Linux下设置xhost方法步骤

<wbr><wbr></wbr><wbr><wbr></wbr><wbr><wbr></wbr> 第一步：用root登陆</wbr></wbr></wbr>linux，启动vnc服务；

<wbr><wbr></wbr><wbr><wbr></wbr><wbr><wbr></wbr> 第二步：根据vnc起来的端口，设置export DISPLAY=localhost:1（1表示vnc在第一个tty上启动的），vnc的启动信息如下：</wbr></wbr></wbr>

1. [root@localhost<wbr><wbr></wbr>~]#<wbr><wbr></wbr>vncserver <wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr>
2. <wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr>
3. New<wbr><wbr></wbr></wbr>'localhost:1<wbr><wbr></wbr>(root)'</wbr><wbr><wbr></wbr>desktop<wbr><wbr></wbr>is<wbr><wbr></wbr>localhost:</wbr></wbr></wbr>1<wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr>
4. <wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr>
5. Starting<wbr><wbr></wbr>applications<wbr><wbr></wbr>specified<wbr><wbr></wbr>in<wbr><wbr></wbr>/root/.vnc/xstartup <wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
6. Log<wbr><wbr></wbr>file<wbr><wbr></wbr>is<wbr><wbr></wbr>/root/.vnc/localhost:</wbr></wbr></wbr>1.log <wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr>
7. <wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr>
8. [root@localhost<wbr><wbr></wbr>~]#<wbr><wbr></wbr>export<wbr><wbr></wbr>DISPLAY=localhost:</wbr></wbr></wbr>1<wbr><wbr></wbr><wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr></wbr>
9. [root@localhost<wbr><wbr></wbr>~]#<wbr><wbr></wbr>xhost<wbr><wbr></wbr><wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr>
10. access<wbr><wbr></wbr>control<wbr><wbr></wbr>disabled,<wbr><wbr></wbr>clients<wbr><wbr></wbr>can<wbr><wbr></wbr>connect<wbr><wbr></wbr>from<wbr><wbr></wbr>any<wbr><wbr></wbr>host<wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

[root@localhost ~]# vncserver

New 'localhost:1 (root)' desktop is localhost:1

Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/localhost:1.log

[root@localhost ~]# export DISPLAY=localhost:1 
[root@localhost ~]# xhost  
access control disabled, clients can connect from any host

<wbr><wbr></wbr><wbr><wbr></wbr></wbr></wbr>

<wbr><wbr></wbr><wbr><wbr></wbr><wbr><wbr></wbr> 第三步：执行xhost ，并且提示“</wbr></wbr></wbr>access control disabled, clients can connect from any host”才正确。<wbr><wbr></wbr></wbr>

<wbr><wbr></wbr></wbr>

<wbr><wbr></wbr>关键在于用xhost管理Xserver的访问权限</wbr>