Hello
inexplicably all the monitoring of my infrastructure has stopped.
I have performed some checks and I try to summarize below
- Monitor Server version: 2024.0.1
- Monitor agent version: 2024.0.1 on a vm updated 2024.0.2
- ArcGIS Enterprise: 11.3
from the ArcGIS Monitor home page I note no data available

So I checked how long it has been stopped, and I found out from the Retention Policy screen that it has been stopped since 11/30/24.
The DB shows no problems fortunately

In the Monitoring and Host section I find all the VMs in Critical and Connectivity anomaly (found 2 hours because I performed a server reboot to see if it resumed normal operation)

I went to check a host out of curiosity and ran some commands, it seems the agent has disconnected from the server.

I also checked the .env file in the config store folder, everything seems ok

on a VM I upgraded the agent, but unfortunately it did not reconnect.
What do you think it could be?
I would like to have your opinion before doing a clean install of all the agents.
ps: if I re-register, the server tells me it is already registered
Thank you
Virgilio