xterm error question

[Rick Stevens]

GoijI P wrote:
> just found out telnet to hostA from HostB fails.
> could this be cause of xterm failure?.
> i checked some settings , not sure why telnet from hostB
> to hostA fails but other way it works. same thing with ssh.

Uh, what?  You're contradicting yourself there.  Which of the following
work?

	HostA --> telnet --> HostB
	HostB --> telnet --> Host A

Also remember that, by default, telnet is disabled on Red Hat.  You must
enable it by use of redhat-config-services or ntsysv or by manually
tweaking the xinetd.d files and sending xinetd a SIGHUP.  For X to work,
the portmapper must be running on the X server machine and you must not
block the ports used via iptables (yet another security risk over and
above using telnet).

We HIGHLY recommend that you NEVER, EVER use telnet.  It is an
incredibly insecure protocol and one of the easiest to hack and break
into a system.  You should use ssh and use X forwarding under it.  You
only need to have the ssh port (port 22) open on your firewall to use
it that way.  All X data is therefore encrypted and passed through the
ssh tunnel.  FAR more secure.

>> From: Aaron Cline <acline2 at cox.net>
>> Reply-To: Getting started with Red Hat Linux 
>> <redhat-install-list at redhat.com>
>> To: Getting started with Red Hat Linux <redhat-install-list at redhat.com>
>> Subject: Re: xterm error question
>> Date: Tue, 20 Apr 2004 17:28:25 +0100
>>
>> Also, the portmapping service must be turned on.  '/etc/init.d/portmap 
>> start'
>>
>> You can also try 'xhost +' on HostA, then 'ssh -X hostb', and finally 
>> run the app on HostB.
>>
>> ssh -X sets up X-Forwarding to go through the ssh tunnel automagically.
>>
>> GoijI P wrote:
>>
>>> did ,xhost +, on HostA:
>>> access control disabled,
>>> clients can connect from any host
>>>
>>> did , echo $DISPLAY, on HostA:
>>> :0.0
>>>
>>> did, echo $DISPLAY, on HostB:
>>> HostA:0.0
>>>
>>> tried setenv with HOSTAIP:0.0
>>> ,still came with same xterm error.
>>>
>>>
>>>> From: Rick Stevens <rstevens at vitalstream.com>
>>>> Reply-To: Getting started with Red Hat Linux 
>>>> <redhat-install-list at redhat.com>
>>>> To: Getting started with Red Hat Linux <redhat-install-list at redhat.com>
>>>> Subject: Re: xterm error question
>>>> Date: Mon, 19 Apr 2004 17:10:56 -0700
>>>>
>>>> GoijI P wrote:
>>>>
>>>>> from host A, did:
>>>>> telnet HostB
>>>>> setenv DISPLAY HostA:0.0
>>>>> In another terminal on HostA terminal did: xhost +
>>>>> in telnet session terminal did: xterm
>>>>> got this error:
>>>>> xterm Xt error.
>>>>> can't open display HostA:0.0
>>>>>
>>>>> HostB is NIS client.
>>>>>
>>>>> /etc/hosts and /etc/passwd files look ok
>>>>> on NIS server and client.
>>>>
>>>>
>>>>
>>>> Are you certain the display name is HostA:0.0?  Sometimes they're just
>>>> HostA:0 (no decimal point).  On HostA, "echo $DISPLAY" and make sure
>>>> HostB uses that ID.  You may also need to specify it via IP address
>>>> unless "HostA" resolves via DNS or /etc/hosts files.
>>>> ----------------------------------------------------------------------
>>>> - Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
>>>> - VitalStream, Inc.                       http://www.vitalstream.com -
>>>> -                                                                    -
>>>> -  You know the old saying--any technology sufficiently advanced is  -
>>>> -               indistinguishable from a Perl script                 -
>>>> -                                 --Programming Perl, 2nd Edition    -
>>>> ----------------------------------------------------------------------
>>>>
>>>>
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>>
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-- 
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-     There are only 10 kinds of people in the world -- those who    -
-                 understand binary and those who don't              -
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