_XSERVTransSocketCreateListener: failed to bind listener

Raju further reported that he was unable to start vncserver process and was getting errors:

$ perl /usr/local/bin/vncserver :55

New 'X' desktop is prod2039:55

Starting applications specified in /export/home/applmgr/.vnc/xstartup

Log file is /export/home/applmgr/.vnc/prod2039:55.log

$ cat /export/home/applmgr/.vnc/prod2039:55.log

_XSERVTransSocketCreateListener: failed to bind listener

_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed

_XSERVTransMakeAllCOTSServerListeners: failed to create listener for local

Fatal server error:

Failed to establish all listening sockets

xrdb: Connection refused

xrdb: Can't open display 'prod2039:55'

$

I did a truss perl /usr/local/bin/vncserver and found that it was unable to write to /tmp/.X11-unix

I logged in as root and changed the permissions of 

chmod 777 /tmp/.X11-unix

It worked after that.

Sometimes when you are unable to start vnc on a specified port the reason is that the socket for that port is owned by some other user:

$ cd /tmp/.X11-unix

$ ls -ltr

total 0

srwxrwxrwx   1 root     root           0 Nov 25 17:42 X0

The format is Xn where n is the port number.  For example the file X0 for port 0, X1 for port 1.

You should login as that user and remove the /tmp/.X11-unix/Xn