connection problem to the X server

connection problem to the X server

[Miguel González Castaños]

Dear all,

I have a web application developed using JSPs, that needs to connect to 
a X server to show a statistics graphic. The logs when I issue an "xhost 
+ localhost" of Tomcat gives this :

Xlib: connection to "localhost:0.0" refused by server
Xlib: No protocol specified

xhost:  unable to open display "localhost:0.0"

When I issue a xhost to a different box, it doesnt fail. I have been 
googling a bit, I got the impression that using xhost is not safe, and 
it is better to use xauth. Anyway I still dont know how to fix this.

Regards and sorry for my english

Miguel

Re: connection problem to the X server

[Glynn Clements]

Miguel González Castaños wrote:

> I have a web application developed using JSPs, that needs to connect to 
> a X server to show a statistics graphic. The logs when I issue an "xhost 
> + localhost" of Tomcat gives this :
> 
> Xlib: connection to "localhost:0.0" refused by server
> Xlib: No protocol specified
> 
> xhost:  unable to open display "localhost:0.0"
> 
> When I issue a xhost to a different box, it doesnt fail. I have been 
> googling a bit, I got the impression that using xhost is not safe, and 
> it is better to use xauth. Anyway I still dont know how to fix this.

If the X server is already using X authentication, it won't allow
xhost to connect. Run xhost without arguments; if you get the
response:

	$ xhost
	access control enabled, only authorized clients can connect

then the X server is using X authentication. In that case, you will
have to copy the necessary authentication credentials into a file
which can be read by Tomcat, and set the environment variable
XAUTHORITY to refer to that file. See "man xauth" for details.

-- 
Glynn Clements <glynn.clements@virgin.net>
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