I have installed freeSSHD on my Windows machine, created a user, enabled tunneling, copied over a public rsa key, and installed NSClient++. On my Nagios server, I have Nagios running and a Windows.cfg file that looks correct.

I am able to ssh from the nagios box to the windows box with the following:

ssh user@windows-box-ipaddr


ssh -f -N -L administrator@windows-box-ipaddr

Despite this, I'm seeing errors such as these in Nagios:

connect to address and port 12489: Connection refused

I am not sure what IP address needs to go in the windows.cfg for the define host, nor am I sure what the NSClient++ IP should be set to.

What I do know for certain is that I can get this servers to connect through SSH. I am thinking that I should be using another port or perhaps I need to open many ports in the firewall. At this point I am at a standstill.

  • what are you trying to do, exactly? and why does it involve ssh tunneling? – Keith Mar 3 '17 at 0:51
  • Keith, I am trying to monitor a Windows server that is not on our network. Either a VPN or SSH tunnel appear to be the most effective ways to accomplish this. – RE_Woods Mar 3 '17 at 3:59

NSCLient++ by default uses port 12489, as the error message reports.


ssh -f -N -L 12489:localhost:12489 administrator@windows-box

Of course this requires that NSClient++ is actually running and listening on that port. Your command would forward port 1433 - where did you get that port number?

  • Some bum docs I read... It's working now thank you. I am trying to get Tomcat and Apache to show up now... – RE_Woods Mar 2 '17 at 23:22
  • Is there a way to monitor apache and Tomcat? – RE_Woods Mar 3 '17 at 0:02
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