gmane.network.freenx.general

Re: Shadow Session fails to attach

2013-05-22T17:10:12

Ling-Yan Lau <ll220< at >medschl.cam.ac.uk> 
Sent by: freenx-knx-bounces< at >kde.org
22/05/2013 14:46
Please respond to User Support for FreeNX Server and kNX Client 
<freenx-knx< at >kde.org>


Hi everyone,
 
I have a problem with my FreeNX server in that everything works find 
except I can’t get shadowing to work.
 
My setup is as follows:
 
[SNIP]

Error: Aborting session with 'Cannot establish any listening sockets - 
Make sure an X server isn't already running'.
 
I’m not sure what it is that I’ve missed or got wrong in my setup.  Can 
anyone help?
 
Many thanks,
 
Len
 
 [SNIP]

NX> 101 User: cscs
NX> 102 Password: 
NX> 103 Welcome to: me-promis user: cscs
NX> 105 listsession --type="shadow"
NX> 127 Sessions list of user '.*' for reconnect:
 
Display Type             Session ID                       Options  Depth 
Screen         Status      Session Name
------- ---------------- -------------------------------- -------- ----- 
-------------- ----------- --------------------

Shadow Session fails to attach

Ling-Yan Lau — 2013-05-22T13:41:42

Hi everyone,

I have a problem with my FreeNX server in that everything works find except I can't get shadowing to work.

My setup is as follows:

Server OS: Ubuntu 12.04 LTS
FreeXN Version: NXSERVER - Version 3.2.0-74-SVN OS (GPL, using backend: 3.5.0)
Client OS: Windows 7
NX Client: NoMachine NX Client for Windows Version 3.5.0-9

The clients can all connect and disconnect sessions on the server.  I have my shadow client configured so the Desktop is set as "Shadow".  Once connected I get a list of available sessions.  If I select a session and press Attach I get an error message "The NX Client received an error from the server. Please check the details for more information".

I've listed the contents at the bottom of this email.

If I check the suggested session file.  The contents of which are:
Error: Aborting session with 'Server is already active for display 2003
        If this server is no longer running, remove /tmp/.X2003-lock
        and start again'.

If I remove the lock file and retry I still ge

Re: NX disappears after starting

Chris — 2013-05-03T20:44:55

freenx-knx-bounces< at >kde.org wrote on 03/05/2013 21:32:09:

[SNIP]


The issue is that the "minimal installation" doesn't really
work in RHEL

If you install X later it just does its OWN dependencies
so
you don't get all the legacy stuff . . .


________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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Re: NX disappears after starting

Chris — 2013-05-03T20:39:51

freenx-knx-bounces< at >kde.org wrote on 03/05/2013 21:24:24:


thanks for that . . .  :-)



Ye O.P. is fedora-ing
tho he didn't trouble us by telling us which version
( seems to be a trend with OPs in this group )
so
there may be another mess heading your way . . .


I just did  a Centos 6 install ( zimbra ) for a change
instead
of my usual SuSe so I may be joining you . . 

tho

Alan Cox on fedora 18 

https://plus.google.com/111104121194250082892/posts/aCiB7kTLXTh

http://www.theregister.co.uk/2013/01/24/alan_cox_quits_linux_development/

did make me wonder what was arriving next in Redhat land.






________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

___________________________________________________

Re: NX disappears after starting

Les Mikesell — 2013-05-03T20:32:09

Ummm, yeah.  Gotta love non-backwards compatible changes...


Isn't it normal to build/test in a minimal chroot?


I haven't hit this with the Centos rpm, but not sure what different
base installs I have had.

Re: NX disappears after starting

Akemi Yagi — 2013-05-03T20:24:24


Hmmm, my name was mentioned ...

Indeed we (RHEL users) did have this very problem of some package
(xorg-x11-fonts-misc to be specific) not installed by default. I'm not
going through all the details but the issue occurred when RHEL went
from 5.x to 6.x. Fortunately we noticed it when RHEL 6.0 was still in
beta and was able to add Requires: to our package. So far I have not
heard any complaints from RHEL/CentOS/SL users... :-)

Akemi
________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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_____________________________________________

Re: NX disappears after starting

Chris — 2013-05-03T20:13:07

freenx-knx-bounces< at >kde.org wrote on 03/05/2013 20:45:51:

[SNIP]
 

They solve all the ones that the packager finds ( are missing )
when he/she/it compiles from source and builds the rpm

BUT

If you have "it" installed already because you went for
        workstation
or some such when you first installed
then you won't have it as a "dependency" because
that just means packages differing from base
( i.e. every rpm doesn't list every single other rpm it needs )


Redhat have now produced a mix of "base" configurations,
the smallest of which as far as I can see gives you a non
fuctioning installation which won't install any other
packages so you can't fix it either.

They have also split X up into smaller packages which are
installed by default.

BUT

Things have moved on since nomachine forked X11
so the legacy stuff is installed but is not depended
upon any more.

i.e. if you can miss installing older things now
without hitting a dependency


This means that to produce an accurate list of
dependencies for ev

Re: NX disappears after starting

Les Mikesell — 2013-05-03T19:45:51

I thought rpm-packaging and yum were supposed to solve all of our
dependency problems....

--
   Les Mikesell
     lesmikesell< at >gmail.com
________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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Re: NX disappears after starting

Chris — 2013-05-03T19:40:01

freenx-knx-bounces< at >kde.org wrote on 03/05/2013 20:30:20:



You are very welcome.

Booring isn't it, all this nonsence . . . .

. . . unless your department/company/charity etc
         already went live of course    D:(

________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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Re: NX disappears after starting

2013-05-03T19:30:20

That did it. While both good and bad hosts had
xorg-x11-fonts-misc installed and they both had the
aforementioned directory, the failing hosts were missing
fonts.dir (but had fonts.alias)


Thanks!!!


On Fri, May 3, 2013 at 3:13 PM, Chris <chris< at >ccburton.com> wrote:

________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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________________________________________________________________

Re: NX disappears after starting

Chris — 2013-05-03T19:13:59

freenx-knx-bounces< at >kde.org wrote on 03/05/2013 19:54:14:

[SNIP]
 


We can all do that,
because
ssh does X forwarding 
so
if you point your DISPLAY at it
xterm hits your session sshd child
and
gets forwarded to your client Xserver



No. It's not FreeNX anyway. It's an nxagent issue.


You could read your log tho' and look for the error message.

Do you have 
        xorg-x11-fonts-misc
installed ??

Do you have such a directory as :- 
        /usr/share/X11/fonts/misc/fonts.dir
??



________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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Re: NX disappears after starting

2013-05-03T18:54:14

% more *
::::::::::::::
clients
::::::::::::::
error opening security policy file /usr/X11R6/lib/X11/xserver/SecurityPolicy
::::::::::::::
errors
::::::::::::::
Loop: WARNING! Connected to remote version 3.5.0 with local version 3.3.0.
Loop: WARNING! Signals were not blocked in process with pid '4598'.
::::::::::::::
options
::::::::::::::
nx/nx,keyboard=pc102/en_US,geometry=1674x967,client=winnt,cache=16M,images=64M,link=lan,nodelay=1,type=unix-desktop,clipboard=both,cleanup=0,produ
ct=LFE/None/LFEN/None,shmem=1,backingstore=1,shpix=1,accept=127.0.0.1,cookie=ce18d3d281cc057c16cddb4b07b02168,id=bigfoot.acme.org-2001-B905994A
2A77E892CB32E3D549F923A2,samba=0,media=0,menu=1:2001

*** pids: directory ***


*** scripts: directory ***

::::::::::::::
session
::::::::::::::

NXAGENT - Version 3.3.0

Copyright (C) 2001, 2007 NoMachine.
See http://www.nomachine.com/ for more information.

Info: Agent running with pid '4598'.
Session: Starting session at 'Fri May  3 14:40:46 2013'.
Info: Proxy running in server mode

Re: NX disappears after starting

Chris — 2013-05-03T18:34:01

freenx-knx-bounces< at >kde.org wrote on 03/05/2013 16:09:28:
[SNIP] 

3.3.0


No display


Yup

Lets see what nxagent has to say for itself

Clear out any/all your old T-* C-* F-* directories from ~/.nx/

**** Make SURE
         your client machine is not NX connected to ANY other
         NX server machine.
****

Try again with xterm in a "floating window" and Logging on.

<Desktop> unix custom
< Run the following command> xterm
<Options> Floating Window

Post ALL the contants of the relevant file named
        session
file from:-

~/.nx/that-session's-details/

if it's there.

It won't have any password details in it.
 





________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

____________________________

Re: NX disappears after starting

2013-05-03T15:09:28

Details button shows no errors:
Info: Proxy running in client mode with pid..
Session: Starting session at ...
Warning: Connected to remote version 3.3.0 with local version 3.5.0
Info: Connection with remote proxy completed
Info: Using LAN link...Info: Using pack method..
Info: Not using NX delta compression
Info: Not using ZLIB data compression
Info: Not using ZLIB stream compression
Info: Not using persistent cache
Info: Forward X11 connections to display :0
Info: Listening to font server connections on port 12001
Session: Session started at...
Info: Established X server connection
Info: Using shared memory params
Session: Terminating at ..
Session: Session terminated at..


In my ~/.nx/.../errors it's a bit more interesting:
at the very end,
xrdb: Connection refused
xrdb: Can't open display :2001
88 (gnome-session:16362): WARNING *: Cannot open display:
Loop: WARNING! Connected to remote version 3.5.0 with local version 3.3.0
...

Not sure if any of that is significant

Finally, nxserver.log  gives
NX> 10

Re: NX disappears after starting

Chris — 2013-05-02T18:36:56

freenx-knx-bounces< at >kde.org wrote on 02/05/2013 17:11:21:


working
All

nxagent is a separate X client  ( server in normal speak ) with its
own libraries
so
the fact that your "normal" X  works doesn't mean that nxagent
will work too . . .

It could be a number of things. Lets start with . . . .


. . . . what's in the FreeNX log.

You may need to turn logging on in /etc/nxserver/node.conf

i.e.

        NX_LOG_LEVEL=6
        NX_LOG_SECURE=1
        NX_LOGFILE=/var/log/nxserver.log
        SESSION_LOG_CLEAN=0

also do
         sudo touch  /var/log/nxserver.log
        sudo chmod 777 /var/log/nxserver.log

Connect to xterm and gnome and send the logging.


________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com

Re: NX disappears after starting

Les Mikesell — 2013-05-02T17:51:00

Does the client show a disconnect with a 'details' button for its side
of the log?  The only other thing I can think of is that the server
side has some invalid session id cached and is trying to resume it but
I thought that was logged somewhere.

--
   Les Mikesell
     lesmikesell< at >gmail.com
________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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________________________________________________________________

Re: NX disappears after starting

2013-05-02T16:11:21

I can run Xnest  on the problem host

The only real difference between the problem hosts and those that work
is that the bad ones are servers (rack mounted Dells) whereas the working
ones are desktop dells but both have the same installation of fedora. All
have the same window managers installed and are running xdmcp broadcast.

Also Hummingbird exceed works against the all these hosts so it doesn't
quite sound like an X11 problem

running custom config for xterm, I get the !M on the black background
and an xterm on a working machine. On the problem hosts, I still get the
!M on the black background then it disappears with no errors.


On Wed, May 1, 2013 at 3:59 PM, Les Mikesell <lesmikesell< at >gmail.com> wrote:

________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Kn

Re: 716 Slave mode failed to start script error?

Chris — 2013-05-02T08:30:15

freenx-knx-bounces< at >kde.org wrote on 02/05/2013 08:27:03:
[SNIP]

"NumberOfPasswordPrompts 1" -p 22 

[SNIP]
errors:

This is caused by  localhost  becoming  ::1   i.e. IPv6

If you aren't   IPv6-ing to ssh you can try
 
        AddressFamily inet
 
in sshd_config
to
pin sshd to IPv4
else
disable IPv6 in 

        /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1




________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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________________________________________________________________

Re: 716 Slave mode failed to start script error?

OwN-3m-All — 2013-05-02T07:27:03

I finally figured it out.  It was again a problem with the /etc/hosts file,
but I'm not sure why it flipped out.

Well I haven't seen this, however  . . .

Yep, all of this looked good, and I verified that my settings were correct.


This proved to be helpful.  I could SSH into the server, but I couldn't SSH
locally on the server.  I checked my logs and found this:

May  2 01:00:04 chi CRON[10551]: pam_unix(cron:session): session closed for
user username
May  2 01:01:50 chi sshd[10619]: Accepted publickey for nx from [myip] port
[number] ssh2
May  2 01:01:50 chi sshd[10619]: pam_unix(sshd:session): session opened for
user nx by (uid=0)
May  2 01:01:54 chi nxserver[10860]: (nx) Failed login for user=[username]
from IP=[myip]
May  2 01:01:54 chi sshd[10619]: pam_unix(sshd:session): session closed for
user nx

SSH would instantly close when I tried it locally with the following errors:

Connection closed by ::1
Connection closed by 127.0.0.1

So, to fix it, I commented all the IPv6 lines from the hosts file, an

Re: NX disappears after starting

Les Mikesell — 2013-05-01T19:59:07

But that doesn't tell you that a gnome session will start correctly
for that user.   If you can't test a local console, can you do
something like
Xnest :1 -query localhost in your ssh session?    I'm not sure if
fedora still runs xcmcp or if it doesn't, what you do instead to get a
graphic login to start.

--
   Les Mikesell
     lesmikesell< at >gmail.com
________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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________________________________________________________________

Re: NX disappears after starting

Chris — 2013-05-01T19:41:22

freenx-knx-bounces< at >kde.org wrote on 01/05/2013 18:42:58:



OK, so it's probably not a windows problem after all then.


 . . . could still be a library file or two . . .



Do the two machines work as local desktop login without NX out of
the picture ??

Are there any other differences specific to these machines ???


Try connecting with xterm instead of gnome

Configure button ( in nxclient )
< general> tab
<Desktop> custom
<settings> button
<run the following command>  xterm



________________________________________________________________
     Were you helped on this list with your FreeNX problem?
    Then please write up the solution in the FreeNX Wiki/FAQ:

http://openfacts2.berlios.de/wikien/index.php/BerliosProject:FreeNX_-_FAQ

         Don't forget to check the NX Knowledge Base:
                 http://www.nomachine.com/kb/

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