dgingerich

The soonest I can do this is Friday afternoon.

Yes, I'm well aware of this. I'm a systems admin, and I set up their router. It's a Cisco RV320 small business router, and is not as easily hacked as the off the shelf consumer routers, and it also quite a bit more reliable. I'm certain it is not the router. The DNS config is handed to these machines via DHCP, so they're definitely correct. The router, wireless AP, and modem have been fully power cycled repeatedly, as have the system, so I know the DNS cache is flushed on each of them. There are a total of 4 computers with this issue: the main computer, the parents' laptop, the middle daughter's Surface Pro, and the youngest's laptop. Attempting an uninstall, update, and reinstall yielded no change. They were able to access the internet through wired connections without trouble as long as Eset was not installed, but as soon as it was reinstalled, the trouble began again. (I think they messed up the connection for the wireless AP because they unplugged it while troubleshooting on their own. I think they may have plugged it into the second WAN port.)

That is if it is operating normally. My sister's aren't. I have found out that this came up right after a "big update" that installed itself. The computers that are not working are now on built 1709 of Windows 10, of which I know for certain last month one was still on 1703. I'm having her uninstall Eset, install all the available updates (to 1803) and then reinstall Eset. I think this might do it.

It's showing under "Connected Home Monitor" it shows a yellow exclamation point on the computer (the center) and shows that traffic was blocked, and when clicking on that, it shows that "Microsoft DNS client" was blocked 400+ times. That's local. That is definitely NOT the router.

I've been in professional IT for over 20 years now, so I'm the family central support guy. I have used Eset Total Security for many years now and not had a problem, but this morning I got a call from my older sister, to whom I recommended Eset several years ago, saying she was ready to smash all her computers. After some troubleshooting, I found she was unable to do anything, and the firewall was showing that it was blocking traffic from every device on the network, including the network firewall/router. It was also blocking everything going out, including the DNS client! What's worse is that her daughter's Surface Pro is doing the same. Trying to bring up a browser gives a security warning just as it is starting. The browser starts, but nothing displays on it. She can't even print, as the firewall is showing that it is blocking traffic to (and from, somehow) the network printer. I live 2 hours from her, so I can't just drive down to troubleshoot and fix this myself. The earliest I can get down there is Friday. I don't get it. I have never seen this behavior from anything before. The closest I've experienced was when Bitdefender had their bug that identified all x64 executables as viruses. (That was the reason I switched from them to Eset, so many years ago.) I directed my sister to call Eset support, but I don't know how well she'll fare with this. Her temper is legendary, and she is riled up right now, and I don't know how well non-family will handle that. (I really hated to throw her their way, but I had nothing for her.) Has anyone else experienced this? If so, what caused it? I'm baffled.