Netstat says open, nmap says closed

Hi all,
in linux we are trying to do ssh -X on a particular machine and the X forwarding doesn't work. After entering with SSH, the port for the X forwarding (e.g. 6010) appears open to the netstat, however trying to telnet to that one refuses the connection like if it was closed. Nmap also finds it to be closed. The X forwarding also doesn't work (the X clients also find the port to be closed). The iptables firewall is stopped. What can that be?
.

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