NSClient++: Connection Refused, again and again, with default config

[44kbps]

Hi people of the world :P

I'm just running the NSclient on a Windows machine. I got the default
configuration of the NSC.ini but I have an error in the nagios:
Connection refused
I modified the NSC.ini to run the client on the 12489 port, and I add the IP
of the nagios server on allowed host.
I have no information about the client version, the cpu or some information
in the nagios.
I run a netstat in the windows machine and I get the listening port at 12489
but when I try to connect from telnet on the linux (nagios) machine
I've got a "Connection closed by foreign host."
I scan the machine with the nmap. It don't show the 12489 open of filtered.

What can be wrong?
In the Windows machine there are no firewall.
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