Getting 'Access Denied' on Multiple Websites

Getting 'Access Denied' on Multiple Websites

As the title says, I am getting an 'Access Denied' message on multiple websites. The exact message is:

Access Denied
You don't have permission to access "website name" on this server.

The sites that I have discovered so far are homedepot.com, costco.com, and lowes.com. I have been getting the same message on all of the websites, besides the reference codes, which I will list below:

    Reference #18.15393717.1541289653.5c399d2  
     Reference #18.bf273017.1541289827.c064f1  
 Reference #18.84273017.1541289848.52e1d8  

My home's router is a Linksys EA9400 AC5000 Tri-Band MU-MIMO Wi-Fi Router, and my family and I have tried this on multiple devices, including a Windows PC, an iPhone, and an iPad, and I tried clearing my cookies on all of them, but it confirmed that it was a router problem, not a device problem.

What should I do to try and fix this problem?

Edit: Just rebooted the router, still not working. I'll upload screenshots as soon as I can.

Edit 2:

DNS:

With WiFi:

Sarah Jenkins
Author

Sarah Jenkins

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.