thanks a lot for your fast and very helpful reply. you are right, i forgot to exchange the driveletter in my post... anyway, i tried your suggesstion and it's not working. i added the -p 12490 (beacuse this is the forwarded port). first i got a SSL Handshake failed message. I added the -n option. Now i got CHECK_NRPE: Received 0 bytes from daemon. Check the remote server log.. i enabled nrpe in the nsclient++ ini file, but without success..
but now i know why my command failed! i used the wrong port, so this was another server without drive g.... now everything is fine.