Nagios Support Forum

Version of Nagio XI 2014R2.7
CentOS 6.6
64bit
VMware Image

In the XI GUI under Admin Menu in: Monitoring Engine Status

Monitor Engine Process: No data
Monitor Engine Event Queue: Scheduled Events Over Time: Error: No output from backend!

When I attempt to restart Nagios Services from XI or apply a configuration request I get Your request was not processed in a timely manner. It may still execute, as the server maybe temporarily busy.

Any help would be appreciated. Thank You!

SSH into your Nagios XI server as root and run these commands:
Please post the full output of those commands if there are any errors.

If it starts properly, give it a minute or two then check the XI interface.

I received

Starting nagios: done

but I still have no data and Error: No output from the backend.

When I was attempting to start up Nagios Mobile I went into the httpd.conf file and did an edit on something that was commented out. Once it did not work, I just commented out those lines again so I don't know how that would impact my connection from XI.

We recently changed our Nagios IP from an internal to an external IP so that we can reach it externally.

Did you make sure to change the program url (admin --> manage system settings) when you changed the ip for the nagios server?
Do you have a hardcoded hosts entry for the server with the old ip?

I checked the hosts and the IPs match.

I found this that may shed some light as to why the monitoring engine is not connecting:

Last login: Fri Jun 26 10:22:00 2015 from 172.24.36.14
[root@monitor01 ~]# cd /usr/local/nagiosxi/scripts
[root@monitor01 scripts]# ./reconfigure_nagios.sh
URL: http://localhost/nagiosxi/includes/components/ccm/
CMDLINE
/usr/bin/wget --save-cookies nagiosql.cookies --keep-session-cookies http://loca lhost/nagiosxi/includes/components/ccm/ --no-check-certificate --post-data 'subm it=Login&hidelog=true&loginSubmitted=true&username=nagiosxi&password=n@gweb' -O nagiosql.login--2015-06-26 15:44:32-- http://localhost/nagiosxi/includes/compon ents/ccm/
Resolving localhost... ::1, 127.0.0.1
Connecting to localhost|::1|:80... failed: Connection refused.
Connecting to localhost|127.0.0.1|:80... failed: Connection refused.
NAGIOSQL LOGIN FAILED!
[root@monitor01 scripts]# ./reconfigure_nagios.sh
URL: http://localhost/nagiosxi/includes/components/ccm/
CMDLINE
/usr/bin/wget --save-cookies nagiosql.cookies --keep-session-cookies http://localhost/nagiosxi/includes /components/ccm/ --no-check-certificate --post-data 'submit=Login&hidelog=true&loginSubmitted=true&user name=nagiosxi&password=n@gweb' -O nagiosql.login--2015-06-26 15:51:10-- http://localhost/nagiosxi/incl udes/components/ccm/
Resolving localhost... ::1, 127.0.0.1
Connecting to localhost|::1|:80... failed: Connection refused.
Connecting to localhost|127.0.0.1|:80... failed: Connection refused.
NAGIOSQL LOGIN FAILED!
You have new mail in /var/spool/mail/root


Any help is greatly appreciated.

Are you using a proxy server? You may need to exclude localhost in wgetrc

This article shows you the required steps:

http://support.nagios.com/wiki/index.ph ... th_Proxies

Something else to try.
Open two ssh sessions.

In the first one run: in the second session run: Does the first ssh session output anything?

You might also try the same steps except this time tail the access_log

First SSH Session: Second SSH Session: I am considering building a new Nagios server and figuring out how to Export the data. I am new to this system. I am going to try and call Nagios today.

Could you post the following file to we can review it?

i have the same issue:

Monitor Engine Process: No data
Monitor Engine Event Queue: Scheduled Events Over Time: Error: No output from backend!


Did anyone ever solve this? For me it started after the most recent upgrade.