solution: SSH login takes long time

vi /etc/ssh/sshd_config
   >> UseDNS no

# sshd -ddd
# ssh -vvv 

Reference:
http://ubuntuforums.org/archive/index.php/t-630623.html

get clipboard from a linux VNC server

vi ~/.vnc/xstartup
   >> vncconfig -nowin &

Reference:
http://www.g-loaded.eu/2005/11/10/configure-vnc-server-in-fedora