I've been troubleshooting NCPA stopping working, and after extracting the package from the official repository, I can't find the ncpa_listener binary inside.
Your Nagios Chatbot suggests that it should be there, but I can only find static/ and templates/ folders in /usr/local/ncpa/listener/.
Could someone confirm if the NCPA 3.1.3-1 package is complete?
I downloaded it from:
https://repo.nagios.com/deb/noble/pool/main/ncpa-3.1.3-1.amd64.deb
Here’s what I see after extracting it:
$ dpkg-deb -x ncpa-3.1.3-1.amd64.deb ncpa_extracted
$ ls -l ncpa_extracted/usr/local/ncpa/listener/
total 8
drwxr-xr-x 7 ed ed 4096 Jan 23 16:45 static
drwxr-xr-x 5 ed ed 4096 Jan 23 16:45 templates
Does anyone else have this issue, or is my download possibly corrupted?
Thanks in advance.
The functionality of ncpa_listener was moved into /usr/local/ncpa/ncpa in NCPA v3.
What issues are you having with NCPA right now?
I'll see what we can do about the chatbot not having guidance for NCPAv3.
Thank you. All up and running again. Not sure what the original cause was as tried so many things and it worked a couple of weeks ago on an older version, but it began with 403 errors then those went to 111 errors.
403 Forbidden Errors:
The allowed_hosts section in ncpa.cfg had a subnet (x.x.x.x/26) that wasn’t being recognized properly (not sure if that was in there when it worked originally or not).
This caused API requests from my Nagios XI admin on VMware and :5693/gui/stats in the browser to be rejected.
Fix: Replaced the subnet with explicit IP addresses, and 403 errors went away but became 111.
Service Startup Issues:
NCPA wouldn’t start properly because an old instance was still running, causing conflicts (Another instance is already running (pid ####)).
Fix: Manually killed any stuck NCPA processes (pkill -9 ncpa) and restarted the service cleanly.
Keyring / Repository Issues (Debian/Ubuntu 24.04):
Adding the Nagios APT repository initially caused NO_PUBKEY errors because Ubuntu 24.04 no longer supports apt-key add.
Fix: Used the new keyring format:
sudo mkdir -p /etc/apt/keyrings
wget -qO - https://repo.nagios.com/GPG-KEY-NAGIOS-V3 | sudo tee /etc/apt/keyrings/nagios.asc > /dev/null
and updated the repo entry to:
deb [signed-by=/etc/apt/keyrings/nagios.asc] https://repo.nagios.com/deb/noble /
Glad to hear it!
Hello @edindubai, It's possible that NCPA v3 does not support subnet matching for allowed IPs. I will file an issue and have it checked out so that it can support that functionality in the future. Thank you for reporting this!
I will also file an issue to investigate whether the upgrade is properly removing the old version of NCPA on Ubuntu 24 as that would explain the issue encountered here.
