I’ve been using Icinga2 with little to no issues for a long while now. We have the agent automatically deploying and everything has been working perfectly for quite some time.
Today, I have a Windows server that was previously working with the agent all of the sudden reporting it has no connection with icinga2.
I tried my usual fixes that always have worked in the past. For example uninstalling it and letting it reinstall. This didn’t resolve the issue. I also disabled the firewall on both the Windows server and the Icinga2 server for troubleshooting purposes. This did not help either.
I see no errors or warnings in the deployments through director and I can’t think of anything that has changed recently except for cutting over the Icinga2web to https (this works fine).
All other Windows agents continue to connect and monitor services as expected.
What could be causing this? Where should I look?