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  • Sounds like you have a firewall running, have a look at iptables -L Commented Nov 5, 2013 at 12:13
  • I have put the output of iptables -L in the question. Commented Nov 5, 2013 at 12:25
  • You want to connect o ports 6817 & 6818? Why does port 631 have to do with this? Also your information is a bit off: nc -v server1 631 results in nc: connect to server1 port 5989. Port 631 vs 5989... Commented Nov 5, 2013 at 13:34