It’s definitely not the latter. It’s a fancy antivirus known as an EDR - Endpoint Detection and Response. Purely security software for defending against cyber attacks

This occurred overnight around 5am UTC/1am EDT. CS checks in once an hour, so some machines escaped the bad update. If your machines were totally off overnight, consider yourself lucky

https://github.com/microsoft/MS-DOS/blob/main/v4.0/src/DOS/CTRLC.ASM
; The user has returned to us.
So ominous.
; Well... time to abort the user.
Goodbye

Mine is already talking about this news in a negative light. Makes my life easier to bring in opentofu

If there’s an option on the AP to not permit link local routing within a vlan/ssid, that will force all traffic up to the firewall. Then you can block intrazone traffic at the firewall level for that vlan.
I’ve seen this in Meraki hardware where it’s referred to as “client isolation”. Ubiquiti might be able to do this too.

DO NOT REDEEM