It seems ever since my laptop updated to Windows 11, I get this error for trying to access Costco or Lego.

I would assume if I changed the public WAN IP, my issue would go away, at least temporarily get removed from the blacklists.

But my Deco doesn't seem to have a way to change its MAC address :-(

I think if I leave the unit off for long enough, it will lose its IP and my ISP will probably assign a different IP so I may try that.

My problem got resolved. I have a cable modem and a separate Deco X20 Mesh wifi router. The xfinity tech plugged his computer directly to the cable modem and he was able to access the sites I've been having problems with. I then used the MAC Clone capability of the Deco to set a new MAC address. After rebooting and powering off and on the Deco, things started working again.

I had this issue for over a week. I called my network company Eero, spent an hour on the phone with them, but they were not able to resolve it. I had asked them about changing the IP but I am not sure if they actually did. They suggested I call my service provider. I spent 30 minutes on the phone with them, once again did the whole thing of factory resets, powered down modem and router for 5 minutes, none of these things worked. They said they would send out a tech. The tech came today, tried several things like updating some of the hardware outside, that didn't work. In the end, they did another complete power down, REPLACED THE ETHERNET CORD BETWEEN THE ROUTER AND MODEM, and that worked. I again have access to all of the sites. 🤷‍♀️

There is some traffic about fortigate firewall and FQDN issues. ???

Using Bing search: Blacklist due to No registry was found for this FQDN

Perhaps the websites or Microsoft are using Fortigate v2.6. The release notes for this software is April 17. I started having the problem before this. Fortigate v2.8 is supposed to fix it. See: FQDN address object shows unresolved in G... - Fortinet Community

I do have one mapped network drive and am using Radmin VPN. Perhaps that is triggering the Fortigate issue.

Thanks,

Greg

I dug a bit further following takabanana's input. I ended up with an "No registry was found for this FQDN" error from one DNS site. Could others try the same thing and see if you get the same results? Not sure whether to Microsoft or Xfinity (owned by Comcast) has the issue.

1. I have Xfinity. I called them and tried to get them to change the IP Address. The would not. I have my own NetGear Cable Modem.
2. I turned off my cable modem for more than 24 hours.
3. The IP Address did change, but problem continues.
4. I checked the blacklist sites again

• https://whatismyipaddress.com/blacklist-check  NO ISSUES
• https://dnschecker.org/ip-blacklist-checker.php  ONE ISSUE flagged (see below) The 2nd one had one site flagged. Same issue flagged yesterday with a different IP Address.

a) Details of the flagged site using the (https://dnschecker.org/ip-blacklist-checker.php) site

b) I then clicked on the Details and here is what came up leaving off the IP Address

c) Then when to https://Matrix.sbfbl.net/<ipaddress> and here is what I got.

                                       New query

Check result of IP
<ipaddress>This is the rDNS found:

• <https://matrix.spfbl.net/c-<ipaddress>.hsd1.nh.comcast.net> generic rDNS.

No Generic rDNS will be accepted to name email servers.Register a valid rDNS for this IP, which points to the same IP. The rDNS must be registered under your own domain for you be able to delist it.

d) I then clicked on the c-<ipaddress>.hsd1.nh.comcast.net and got

                                                   New query

Check the result of domain
c-<ipaddress>.hsd1.nh.comcast.netNo registry was found for this FQDN.