VNC server failed with "A VNC server is already running as :X" while vncserver restart.

Issue

• VNC server failed with "A VNC server is already running as :X" while vncserver restart.

• VNC server is not starting and getting the following error.

  # service vncserver restart
  Shutting down VNC server: 3:testuser 5:testuser2     [FAILED]
  Starting VNC server: 3:ctmagt70
  New 'test1:3 (testuser)' desktop is test1:3
  
  Starting applications specified in /tsc/apps/testuser/.vnc/xstartup
  Log file is /tsc/apps/testuser/.vnc/tscpinf001:3.log
  5:testuser2 A VNC server is already running as :5    [FAILED]