Trouble connecting to RH 6 server using NCPA

[ronafisher2]

Greetings,

Running a Nagios 4.4.6 core server and using NCPA active checks on a group of hosts. All Windows hosts and a RHEL 8 server working fine.

Got a Redhat 6 server with the NCPA 2.2.2 linux 64bit client installed and listener is up. Firewall opened for default tcp 5693 on the client. Set token and IP = 0.0.0.0 in ncpa.cfg file. Doing a manual API check

[nagios@server nagios]$ /usr/local/nagios/libexec/check_ncpa.py -H remoteserver -t token -P 5693 -M 'processes' -v
Connecting to: https://remoteserver:5693/api/processes ... jS&check=1
An error occurred:
UNKNOWN: An error occured connecting to API. (Connection error: '[Errno 113] No route to host')

On the remote server ran tcpdump and it shows the nagios server hitting it

[root@remoteserver tmp]# tcpdump -i eth0 port 5693
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
16:29:22.471737 IP server.36388 > remoteserver.5693: Flags , seq 4117186990, win 29200, options [mss 1460,sackOK,TS val 2024861410 ecr 0,nop,wscale 7], length 0
^C
1 packets captured
2 packets received by filter
0 packets dropped by kernel

Any ideas?

Ron

[ronafisher2]

This was an iptables issue needing to add ACCEPT rules before REJECT rules on the client.

[benjaminsmith]

This was an iptables issue needing to add ACCEPT rules before REJECT rules on the client.

Cool. Glad you got it sorted out. We'll mark this as resolved.

Cheers,
Benjamin