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

[Kevin Keane]

"Connection closed by foreign host" really suggests that the connection 
could be established, but NSClient closes it immediately. Check for a 
typo in the allowed host configuration.

The rest is just general networking troubleshooting, in case I'm wrong 
on that.

First, a stupid question: you say that netstat shows that port 12489 is 
listening - but is it listening on the right interface/IP address? It 
may only be listening on 127.0.0.1 - localhost.

Can you ping from the Linux host to the Windows machine? If you can't, 
it's a network connectivity issue. Check cables, routers etc.

While you are at it, also check that you are using the correct DNS name, 
and that it maps to the correct IP address. I've sometimes connected to 
the wrong workstation by accident.

If you CAN ping from the Linux host to the Windows machine, try 
connecting to port 12489 from the Windows machine itself.

Try both connecting to localhost, and to the IP address of the windows 
machine.

If either one of these succeed, double-check that there really is no 
firewall on the Windows machine.

Also try connecting to port 12489 from another workstation connected to 
the same network switch. If that succeeds, there might be a 
router/firewall somewhere in your network that blocks this traffic.

44kbps wrote:
> 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.
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by:
> SourcForge Community
> SourceForge wants to tell your story.
> http://p.sf.net/sfu/sf-spreadtheword
> ------------------------------------------------------------------------
>
> _______________________________________________
> Nagios-users mailing list
> Nagios-users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nagios-users
> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
> ::: Messages without supporting info will risk being sent to /dev/null


-- 
Kevin Keane
Owner
The NetTech
Find the Uncommon: Expert Solutions for a Network You Never Have to Think About

Office: 866-642-7116
http://www.4nettech.com

This e-mail and attachments, if any, may contain confidential and/or proprietary information. Please be advised that the unauthorized use or disclosure of the information is strictly prohibited. The information herein is intended only for use by the intended recipient(s) named above. If you have received this transmission in error, please notify the sender immediately and permanently delete the e-mail and any copies, printouts or attachments thereof.


------------------------------------------------------------------------------
This SF.net email is sponsored by:
SourcForge Community
SourceForge wants to tell your story.
http://p.sf.net/sfu/sf-spreadtheword
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null