It was DNS. I forgot DNS-Over-HTTPS was configured. Stripping that out fixed.

@Joseph-TP 1. Direct connected to isp modem works 2. VPN on works, vpn off no-go 3. Changing from nextdns, to google and cloudflare, no change 4. Parental control/homeshield was never set up 5. Not...

@ArcherC8 Edge, FF, Chrome, Vivaldi all fail.

@ArcherC8 on vivaldi it redirects to the router login page, and firefox gives this error.

It resolves fine.

@ArcherC8 nope, but if I kick one on it works. Seems to only impact when directly connected to the router.