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Top Forums UNIX for Dummies Questions & Answers xhost: unable to open display???? Post 70696 by encrypted on Tuesday 3rd of May 2005 04:16:18 AM
Old 05-03-2005
You can try this:

1.telnet/ssh into the server.
2.export DISPLAY=<i.p. address of XP machine>:0 (syntax varies for other shells)
3.Open any X-Server application (eg. Kea!X, Exceed etc.)
4.Log in to the server
5.Try running any openwindows application or any graphical application eg.
oracle installer from the cdrom.
 

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XHOST(1)						      General Commands Manual							  XHOST(1)

NAME
xhost - server access control program for X SYNOPSIS
xhost [[+-]name ...] DESCRIPTION
The xhost program is used to add and delete host names or user names to the list allowed to make connections to the X server. In the case of hosts, this provides a rudimentary form of privacy control and security. It is only sufficient for a workstation (single user) environ- ment, although it does limit the worst abuses. Environments which require more sophisticated measures should implement the user-based mechanism or use the hooks in the protocol for passing other authentication data to the server. OPTIONS
Xhost accepts the following command line options described below. For security, the options that effect access control may only be run from the "controlling host". For workstations, this is the same machine as the server. For X terminals, it is the login host. -help Prints a usage message. [+]name The given name (the plus sign is optional) is added to the list allowed to connect to the X server. The name can be a host name or a user name. -name The given name is removed from the list of allowed to connect to the server. The name can be a host name or a user name. Existing connections are not broken, but new connection attempts will be denied. Note that the current machine is allowed to be removed; however, further connections (including attempts to add it back) will not be permitted. Resetting the server (thereby breaking all connections) is the only way to allow local connections again. + Access is granted to everyone, even if they aren't on the list (i.e., access control is turned off). - Access is restricted to only those on the list (i.e., access control is turned on). nothing If no command line arguments are given, a message indicating whether or not access control is currently enabled is printed, fol- lowed by the list of those allowed to connect. This is the only option that may be used from machines other than the controlling host. NAMES
A complete name has the syntax ``family:name'' where the families are as follows: inet Internet host dnet DECnet host nis Secure RPC network name krb Kerberos V5 principal local contains only one name, the empty string The family is case insensitive. The format of the name varies with the family. When Secure RPC is being used, the network independent netname (e.g., "nis:unix.uid@domainname") can be specified, or a local user can be specified with just the username and a trailing at-sign (e.g., "nis:pat@"). For backward compatibility with pre-R6 xhost, names that contain an at-sign (@) are assumed to be in the nis family. Otherwise the inet family is assumed. DIAGNOSTICS
For each name added to the access control list, a line of the form "name being added to access control list" is printed. For each name removed from the access control list, a line of the form "name being removed from access control list" is printed. FILES
/etc/X*.hosts SEE ALSO
X(7x), Xsecurity(7x), Xserver(1), xdm(1) ENVIRONMENT
DISPLAY to get the default host and display to use. BUGS
You can't specify a display on the command line because -display is a valid command line argument (indicating that you want to remove the machine named ``display'' from the access list). The X server stores network addresses, not host names. This is not really a bug. If somehow you change a host's network address while the server is still running, xhost must be used to add the new address and/or remove the old address. AUTHORS
Bob Scheifler, MIT Laboratory for Computer Science, Jim Gettys, MIT Project Athena (DEC). X Version 11 Release 6.6 XHOST(1)
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