Hi,
recently I've updated from FC24 to FC27. Since then remote X connections
don't work anymore. For my environment I'm typically starting an xterm
shell from another computer displaying on my workstation.
When using "gdm", remote X access is en-/disabled with the "DisallowTCP"
setting in "/etc/gdm/custom.conf".
Now, there is a trap door. Xorg changed the default for remote
connections a few releases ago.
Old releases listened on the network unless "-nolisten tcp" was
specified. Newer releases only listen on the network
if "-listen tcp" is specified on the command line to start the X server.
This means that gdm either needs to add "-nolisten tcp" (old server,
DisallowTCP=true) or "-listen tcp" (new server, DisallowTCP=false)
to the X server command line.
This is handled by conditional compilation in gdm (depending on a
HAVE_XSERVER_THAT_DEFAULTS_TO_LOCAL_ONLY define).
The setting for this define is determined in configure.ac, lines
dnl
---------------------------------------------------------------------------
dnl - Check if Xorg is new enough to require '-listen tcp' (1.17)
dnl
---------------------------------------------------------------------------
if $PKG_CONFIG --atleast-version=1.17 xorg-server; then
AC_DEFINE([HAVE_XSERVER_THAT_DEFAULTS_TO_LOCAL_ONLY], [], [XServer
disables tcp access by default])
fi
Now, my installed gdm seems to think that my Xserver doesn't default to
"local only". If I set DisallowTCP to true, it adds
a "-nolisten tcp" parameter to the X command line. While it shouldn't
add anything in this case. If I set DisallowTCP to false
it doesn't add anything to the command line (where it should add
"-listen tcp").
On my system, running the test above returns correct results:
$ pkg-config --atleast-version=1.17 xorg-server ; echo $?
0
$
I've build the gdm RPM from source on my local machine, installed it,
and, hey, now everything works as expected.
So I guess that the machine used to build the official packages still
has an old X server installed. If that's true,
could this be fixed?
regards,
chris
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