Hi everybody,

I'm a new mebmer to this list, but I've used LTSP v4.1(.1 ) for a few
months.

Since I used LTSP v4.1(.1) with SuSE 9.0 and thin clients from IBM (NetVista
2000 8363) with kernel 2.4.19 -friendly sent to me by Karl Kappel-, there
were no problems.

Now I have installed CentOS 4.3 for the LTSP machine and I have discovered,
that there are problems, perhaps with firewall and/or SELinux in conjunction
with X, tftp or nfs.

However, the IBM NetVista did not boot.

Ok, please have a look to that, what I have done to "solve" the problem (it
isn't solved utill now).

On the CentoOS box I configured the firewall with the ports shown at LTSP
Wiki.

69:udp (tftp)
111:tcp (Portmapper)
111:udp (Portmapper)
177:udp (XDMCP)
514:udp (Syslog)
2049:tcp (NFS)
2049:udp (NFS)
6000:tcp to 6063:tcp (X; should there be udp defined for these ports too?)

and for extended functionality (future requests? ;) )
7100:tcp (XFS)
7100:udp (XFS)
9100:tcp (printer via LTSP)
9101:tcp (printer via LTSP)
9102:tcp (printer via LTSP)
9200:tcp (ltspinfo)
9210:tcp (ltspswap; NBD Swap Server)
16001:tcp (ESD Sound)
16001:udp (ESD Sound)

But this did not change anything.

Then I turned off SELinux.
Same.

I turned off the firewall and the Client boots. Are ther any other ports
needed?

But the client did not boot completely into X!
Here is the error message:

---8<---

Building the /tmp/XF86Config-4 file
Fatal server error:
Cannot open log file "/var/log/Xorg.0.0.log"

--->8---

Is this a error caused by nfs or X? I don't know.

Then, I turned on again SELinux. No effect.
Of course I know, SELinux will not have any positive effect helping for
booting a thin client ;) , but I think, SELinux belongs to a security
feature of CentOS / RHEL, and it has to be turned on. Without SELinux I
think CentOS will not be needed, or?
Or do I have to turn it off for LTSP purposes?


Next I have configured a telnet shell and a ssh login shell for console 2
and 3. The client now boots to a shell on console 2 and the ssh login on
console 3, but X did not start in any way. Same procedure...   :(

Now I think, that SELinux does not affect booting with the services tftp and
nfs, or am I wrong?. But remote X?

In the meantime I have tested another Linux box as a fat client, with 
"X  :1 -query ltspservername" 
and ... got the CentOS GUI login prompt (xdm).

Ok, so far XDM and remote X seems to be unaffected by SELinux.

Using the same fat client for booting from ltsp (PXE; Intel PRO/100 PCI),
the same error message as above will appear (Fatal server error: Cannot open
log file "/var/log/Xorg.0.0.log").

:(


Now I do not know, where to search for the solution of this problem.

For a first step: is there anyone out there, who has set up LTSP 4.1.x on a
CentOS 4.3 box or Red Hat Enterprise Linux 4 box and
for a second step is she or he using firewall and SELinux, too?
I will be glad if someone may give me a hint.
Please excuse my bad english.

Thanks a lot.

Regards
Sven

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