When I try to access a specific site, I get this error message:
This site can’t be reached
__.org’s server DNS address could not be found.
Search Google for ___ org
I have tried flushing my DNS cache using this methodology: https://help.dreamhost.com/hc/en-us/articles/214981288-Flushing-your-DNS-cache-in-Mac-OS-X-and-Linux
I have power cycled my modem and router
I have connected to my modem via Ethernet cable, bypassing the router
What do you recommend?
So you connect via router and it works; you connect direct to modem and it does not. Correct?
Call the ISP and ask them to flush the modem and then connect. Do the latter while they are on the phone with you.