Nagios Support Forum

I'm feeling sooooooo stupid right now! :oops: I mess up the ip address configs when I tried to change from fqdn to ip, now I'm realizing just now when I cover the ip on gimp to send you the screenshot! :oops: Sorry for the inconveniences :oops: and a BIG THANK YOU for your patience and support :oops...

Sure:


For example ssh is "failing"

the output of the command, executed from nagios host root@nagios:~# nmap -P0 ip_of_one_of_the_failed_hosts Starting Nmap 6.00 ( http://nmap.org ) at 2018-09-24 14:04 EDT Nmap scan report for ipXXX.ip-XX-XX-XX.net (ip_of_one_of_the_failed_hosts) Host is up (0.090s latency). Not shown: 996 closed port...

No way using only IP address on configs did not work

And the nagios service was restarted after making these changes, correct? What options are running with the tcpdump ? I would update it to capture port 53 traffic and also the IP addresses of the that the hosts names we pointing at. Can you share the config files that include the check and command ...

Are the configured checks configured to use the IP address or hostname of the destination? How exactly are you running the plugins and tcpdump on the command line? If the tcpdump is capturing only a specific port or IP address and the configured checks fail due to a DNS issue, this could produce th...

Hi, My nagios 4.2.1 throws a timeout socket on certain hosts, with nrpe and ssh checks, I put a tcp dump on nagios server and one of the affected remote servers, if nagios attempt the check no traffic is detected but if I perform the check via normal shell the tcp dump on both machices detect traffi...