Nagios Support Forum

Yes, I am going to be using check_nt checks.

Thank you for your response.

Hi nscott,

The following ports were opened but receiving "could not fetch informnation from server". With this message, I'm guessing the agent can't send its results back to the Nagios server?

So we ran a capture and we found that the agent is trying to talk to the Nagios server via http, which we did not open. I though the agent and Nagios talks on port 5666 when Nagios initiates the check and the agent send its result back to port 5666 also.

Is the port 80 (agent is using to talk to Nagios) a configuration within the agent that needs to be changed if we want it to use port 5666?

Thanks.

Closing port 80 shouldn't be a problem. All communication between the Nagios server and the client should go through port 5666. There may be another issue - different versions of NRPE on the monitoring server & client, ssl, use of various traffic management software, etc.
Are you running any http checks commands, such as "check-host-alive-http"?

I use webinject with NRPE to check websites.

Below is a parameter on the agent:

;# NAGIOS SERVER PORT
; The port to the nagios server to submit results to.
;nsca_port=5667

If I uncomment this out, would it use this port instead of port 80 to send its result?

Thanks,
Frederick

tgfde,

Before you make any changes in config files, can you post the actual check commands that you run on the Nagios server and on the client from the command line? It is not very clear what you are trying to accomplish.

./check_nt -H $HOSTADDRESS$ -s "$ARG1$" -p 12489 -v CPULOAD -l 5,85,95 $ARG4$ - Ran from Nagios server
could not fetch information from server

I'm trying to monitor an agent in a DMZ (different VLAN with a firewall in between).
I have the following ports openned.

12489 on DMZ servers – Corpmon6 outbound to DMZ
5666 on DMZ servers – Corpmon6 outbound to DMZ
5667 on corpmon6 – DMZ outbound to Corpmon6

With these ports opened, I receive the follwing error:
could not fetch information from server

Can you check the nsclient.log file on the windows machine and see if the information is getting to the agent at all?

Got it resolved.

I checked the agent log and notice that it was complaining about unathorized access for the Nagios server's IP Address, therefore I just added the ip address to the ini file it started working.

Thanks for the help.