Amazon EC2 Instance: local ssh tunnel refused by server - Connection failed - [Connection timed out]

Question

I have a remote administration tool and I'm trying connect client PC to remote PC through an ssh tunnel (local port forwarding) with an Amazon Instance EC2. I receive this error message from Plink, after several attempts to connect (because the connection not is established initially):

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Here is how i'm logging in (to tunnel) via Plink.exe:

plink.exe -v -ssh -2 -P 22 -C -l root -pw mypass -N -L 4021:myhostname.forgot.his.name:4004 root@amazonserver

• I'm able to connect in normal ssh.
• On Amazon Instance, Inbound range already is defined to maximum allowed 0-65535.
• ddclient is running and working correctly (ping shows the IP of the instance).
• The remote PC also has all ports opened on firewall/modem via DMZ (the connection works without an ssh tunnel).

Does anyone have any idea how solve this "enigma"?