Nagios Support Forum

Hi,

We have multiple same configurations ubuntu servers in our infrastructure.

One of our server just stopped pinging, inbound rule for this server is 5666 port is opened and same for all other servers, but why its not pinging.

I have checked with nmap protocol and found below message, please guide.

[root@Nagios-VM ~]# nmap 13.88.189.244

Starting Nmap 6.47 ( http://nmap.org ) at 2016-10-14 09:31 PDT
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 3.04 seconds

Thanks

Ping does not use port 5666.

The nmap is indicating that a ping is not coming back, as well.

What is the result of ping 13.88.189.244

There is no response of ping on nagios server for this host.

[root@Nagios-VM ~]# ping 13.88.189.244
PING 13.88.189.244 (13.88.189.244) 56(84) bytes of data.

Ping uses ICMP, you'll want to make sure that ICMP traffic is allowed on the 13.88.189.244 machine.