Linux Question

I need to monitor windows services(like CPU load, memory usage etc.), so I have installed Nagios monitoring tool. The installation is complete and ‘check_nt’ plugin is also installed. Upto this no error is there, but while executing scripts with agent NSClient++ ‘Connection refused by host’ error still persists.

./check_nt -H 10.112.32.78 -p 1248 -v MEMUSE -w 80 -c 90
              Connection refused by host

./check_nt -H 10.112.32.78 -p 1248 -v MEMUSE -w 80 -c 90
              Socket timeout after 10 seconds

I have verified that nagios is working correctly, as under.

/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Core 3.4.1
Copyright (c) 2009-2011 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 05-11-2012
License: GPL

Website: http://www.nagios.org
Reading configuration data...
   Read main config file okay...
Processing object config file '/usr/local/nagios/etc/objects/commands.cfg'...
Processing object config file '/usr/local/nagios/etc/objects/contacts.cfg'...
Processing object config file '/usr/local/nagios/etc/objects/timeperiods.cfg'...
Processing object config file '/usr/local/nagios/etc/objects/templates.cfg'...
Processing object config file '/usr/local/nagios/etc/objects/localhost.cfg'...
   Read object config files okay...

Running pre-flight check on configuration data...

Checking services...
    Checked 8 services.
Checking hosts...
    Checked 1 hosts.
Checking host groups...
    Checked 1 host groups.
Checking service groups...
    Checked 0 service groups.
Checking contacts...
    Checked 1 contacts.
Checking contact groups...
    Checked 1 contact groups.
Checking service escalations...
    Checked 0 service escalations.
Checking service dependencies...
    Checked 0 service dependencies.
Checking host escalations...
    Checked 0 host escalations.
Checking host dependencies...
    Checked 0 host dependencies.
Checking commands...
    Checked 24 commands.
Checking time periods...
    Checked 5 time periods.
Checking for circular paths between hosts...
Checking for circular host and service dependencies...
Checking global event handlers...
Checking obsessive compulsive processor commands...
Checking misc settings...

Total Warnings: 0
Total Errors:   0

Things look okay - No serious problems were detected during the pre-flight check

M new to nagios, thanks in advance 🙂

Answer

The connection is getting blocked either by a firewall or your Nagios server is not in the nsc.ini file in the “allowed hosts” field. Make sure that port is open on your windows firewall, as well as any other net filters in between your Nagios server and your client.

Nagios – Connection refused & Socket timeout

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Answer