vnc issue after reboot

UNIX Solaris
1

Hi ,

Everytime after reboot when user tries to start vnc below error is thrown

$ vncserver :5
Couldn't start Xvnc; trying default font path.
Please set correct fontPath in the vncserver script.
Couldn't start Xvnc process.

_XSERVTransSocketCreateListener: failed to bind listener
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for local

Fatal server error:
Failed to establish all listening sockets
_XSERVTransSocketCreateListener: failed to bind listener
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for local

Fatal server error:
Failed to establish all listening sockets

It works after removing .X11* files under /tmp . But want to know why this is happening after each reboot and we have to remove these files manually after which user is able to start the session.

A script is seen under /etc/rc2.d which has the below content

#!/sbin/sh

mkdir /tmp/.X11-unix /tmp/.X11-pipe 2>/dev/null
chmod 1777 /tmp/.X11-unix /tmp/.X11-pipe
2

There are options to tell vnc to use just tcp/ip sockets. Since you are usually not local, that is fine. It takes the first one it can bind(). Look around in vncserver perl.

3

sorry but can you please explain me what is the reason of this error and is there any fix for this and why this happens only after reboot.

I am using solaris 10

4

There are two families of sockets X supports, AF_UNIX and AF_INET, see man 2 socket. AF_UNIX only works locally but AF_INET works on the internet. The files are markers for the AF_UNIX listeners, and should be removed on reboot but apparently are not. I usually have too little access to remove them, anyway. I had a similar error before, so I went into vncserver, a perl script, and discovered how to make it just test AF_UNIX. Oh look what google found: Unix - VNC

5

Thanks to you , i didnt know that vncserver was a perl script. i will try this option next time.

vncserver -nolisten local

Btw.. can you please tell me what should i edit in the perl script so that a execution of "vncserver" command the system should automatically pick "-nolisten local" as parmaters.

6

Just set the underlying variable to 1 as default. My vncserver is older, has no option, but look for this:

# If the unix domain socket exists then use that (DISPLAY=:n) otherwise use
# TCP (DISPLAY=host:n)
if (-e "/tmp/.X11-unix/X$displayNumber" ||
    -e "/usr/spool/sockets/X11/$displayNumber")
{
    $ENV{DISPLAY}= ":$displayNumber";
} else {
    $ENV{DISPLAY}= "$host:$displayNumber";
}
$ENV{VNCDESKTOP}= $desktopName;
system("$vncUserDir/xstartup >> " . &quotedString($desktopLog) . " 2>&1 &");
"vncserver" line 190

vncserver just finds an open port and calls Xvnc, so you can call it yourself.

7

Hi ,

Should i replace $displayNumber in the above lines to 1 or should i declare the value of displayNumber=1 in the start of the script ?

8

It's not the display number that is an issue, just let it find an open one, but my vncserver gets chatty along the way. That option is passed to Xvnc, apparently:

$ vncserver -h
usage: vncserver [:<number>] [-name <desktop-name>] [-depth <depth>]
                 [-geometry <width>x<height>]
                 [-pixelformat rgbNNN|bgrNNN]
                 <Xvnc-options>...
       vncserver -kill <X-display>
 
$
 
 
 
#
# CheckDisplayNumber checks if the given display number is available.  A
# display number n is taken if something is listening on the VNC server port
# (5900+n) or the X server port (6000+n).
#
sub CheckDisplayNumber
{
    local ($n) = @_;
    socket(S, $AF_INET, $SOCK_STREAM, 0) || die "$prog: socket failed: $!\n";
    eval 'setsockopt(S, &SOL_SOCKET, &SO_REUSEADDR, pack("l", 1))';
    if (!bind(S, pack('S n x12', $AF_INET, 6000 + $n))) {
        close(S);
        return 0;
    }
    close(S);
    socket(S, $AF_INET, $SOCK_STREAM, 0) || die "$prog: socket failed: $!\n";
    eval 'setsockopt(S, &SOL_SOCKET, &SO_REUSEADDR, pack("l", 1))';
    if (!bind(S, pack('S n x12', $AF_INET, 5900 + $n))) {
        close(S);
        return 0;
    }
    close(S);
    if (-e "/tmp/.X$n-lock") {
        warn "\nWarning: $host:$n is taken because of /tmp/.X$n-lock\n";
        warn "Remove this file if there is no X server $host:$n\n";
        return 0;
    }
    if (-e "/tmp/.X11-unix/X$n") {
        warn "\nWarning: $host:$n is taken because of /tmp/.X11-unix/X$n\n";
        warn "Remove this file if there is no X server $host:$n\n";
        return 0;
    }
    if (-e "/usr/spool/sockets/X11/$n") {
        warn("\nWarning: $host:$n is taken because of ".
             "/usr/spool/sockets/X11/$n\n");
        warn "Remove this file if there is no X server $host:$n\n";
        return 0;
    }
    return 1;
}