Nagios Support Forum

Hello All,

Frequently i am getting internal server error on gui, after few refresh clicks it will display the home page.
I dont see much load on the server and the network as well.
Server running with centos 7.4 and latest version of Nagios core.
I cant find anything interesting in the Nagios logs.
Please help me.

I would take a look into /var/log/messages, /var/log/httpd/access_log, and /var/log/httpd/error_log.

How much memory is on the system? Is your browser going through a web proxy?

Here you go...
[root@nagiosprd]$ tail -10 /var/log/messages
Jan 18 03:55:30 nagiosprd check_nrpe: Remote 10.40.12.13 does not support Version 3 Packets
Jan 18 03:55:31 nagiosprd check_nrpe: Remote 10.40.12.15 does not support Version 3 Packets
Jan 18 03:55:31 nagiosprd check_nrpe: Remote 10.40.12.18 does not support Version 3 Packets
Jan 18 03:55:39 nagiosprd check_nrpe: Remote 10.40.12.19 does not support Version 3 Packets
Jan 18 03:55:42 nagiosprd check_nrpe: Remote 10.40.12.20 does not support Version 3 Packets
Jan 18 03:55:42 nagiosprd check_nrpe: Remote 10.40.12.21 does not support Version 3 Packets
Jan 18 03:55:51 nagiosprd check_nrpe: Remote 10.40.12.22 does not support Version 3 Packets
Jan 18 03:55:51 nagiosprd check_nrpe: Remote 10.40.12.23 does not support Version 3 Packets
Jan 18 03:55:51 nagiosprd check_nrpe: Remote 10.40.12.24 does not support Version 3 Packets


[root@nagiosprd]$ tail -10 /var/log/httpd/access_log
10.40.12.10 - - [18/Jan/2018:03:48:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:49:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:50:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:51:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:52:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:53:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:54:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:55:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:56:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"
10.40.12.10 - - [18/Jan/2018:03:57:52 +0000] "GET / HTTP/1.0" 302 213 "-" "check_http/v2.2.1 (nagios-plugins 2.2.1)"

[root@nagiosprd]$ tail -10 /var/log/httpd/error_log
[Wed Jan 17 11:04:06.482357 2018] [lbmethod_heartbeat:notice] [pid 14710] AH02282: No slotmem from mod_heartmonitor
[Wed Jan 17 11:04:06.491194 2018] [mpm_prefork:notice] [pid 14710] AH00163: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/5.4.16 configured -- resuming normal operations
[Wed Jan 17 11:04:06.491210 2018] [core:notice] [pid 14710] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Wed Jan 17 11:06:14.657349 2018] [mpm_prefork:notice] [pid 14710] AH00170: caught SIGWINCH, shutting down gracefully
[Wed Jan 17 11:06:15.719621 2018] [suexec:notice] [pid 17294] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Wed Jan 17 11:06:15.749376 2018] [alias:warn] [pid 17294] AH00671: The Alias directive in /etc/httpd/conf.d/nagios.conf at line 71 will probably never match because it overlaps an earlier Alias.
[Wed Jan 17 11:06:15.749951 2018] [auth_digest:notice] [pid 17294] AH01757: generating secret for digest authentication ...
[Wed Jan 17 11:06:15.750473 2018] [lbmethod_heartbeat:notice] [pid 17294] AH02282: No slotmem from mod_heartmonitor
[Wed Jan 17 11:06:15.759710 2018] [mpm_prefork:notice] [pid 17294] AH00163: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/5.4.16 configured -- resuming normal operations
[Wed Jan 17 11:06:15.759733 2018] [core:notice] [pid 17294] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'


System has 8GB of memory and i dont use proxy to browse the nagios instance.

Can you post your /etc/httpd/conf.d/nagios.conf file so we can check it's settings?

Seems like issue has been resolved, AD search taking long time to fetch the credentials.
I have fixed it.

Glad it is working. I'll lock the post for you but feel free to open a new one for any other issues.