After updating the server from Ubuntu 20.04 to Ubuntu 22.04, I've been having a number of problems with Nagios Core 4.4.6. Everything was going great before the upgrade, but I'm now having some problems that I'm hoping someone else can help me with.
Problems I'm Having:
Nagios Service Not Starting:
- Sometimes after an upgrade, the Nagios services won't start, and the logs show the following error:
nagios.service: Service hold-off time over, scheduling restart.
- I've attempted manually restarting the service, but it doesn't always work. It may or may not start at different times.
- Periodically, the Nagios online interface is no longer accessible. I get an error message saying "403 Forbidden" when I try to get to it. After looking over the Apache settings, everything appears to be in working order.
- I'm using a few plugins, such as check_nrpe and check_http, and some of them are giving issues now that they weren't before the upgrade. I am uncertain about the next steps to take because the messages of error are not very clear.
- confirmed that every dependency needed by Nagios is installed.
- Looked for any inconsistencies in the Apache settings.
- Made sure every plugin was updated to the most recent version.
Thank you in advance.