I installed VNC server on my system and enabled the ports in  /etc/xinet.d/vnc. Then I was able to connect from Windows  with UltraVNC and RealVNC. But every time when I entered my userid and password the connection was dropped. I found following message in the syslog:

Nov 27 19:34:19 obelix checkproc: checkproc: can not get session id for process 5920

I found following page which helped me to find the solution for the issue: In /etc/hosts I had to comment out the following line (insert # at the beginning of the line ) and everthing works fine now.
#::1             localhost ipv6-localhost ipv6-loopback
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