Oh, and "use these DNS servers" was unchecked, so I guess it was likely using ones automatically? ISP? I changed it to use the ones you supplied. I'll report back if anything changes.
DNS servers should not really effect it. And ISP for sure wont your miners really are not set by isp but by you or dhcp.
If you know old networking you can set a computer to a static IPV4 address different then miner uses. Turn off IPV6 during it. And you should be able to connect from computer to miner just connect with cable. Again you need to know old network settings used such as gateway, and such.
That being said some ISP routers really suck. After I got one it blocked at the time a rental site I was using with asics, and also my security system. Even if all firewall and all rules off on router it blocked it from outside. I got them to turn it into "bridged mode" where not that thing just passes internet through and bought a netgear blackhawk which I love to be my Router.
But that is just my feelings on some ISP routers. It should not be stopping you from seeing other miners. But if you look at the internet on computer static IP on IPV4 I think you will figure out how to connect to miners assuming you know old network info.