Q: One of the websites I visit is not responding when I use my wi-fi.

Things you can try:

1. Flush DNS cache: http://osxdaily.com/2015/11/16/howto-flush-dns-cache-os-x-elcap/

2. Check the hosts file: Launch Terminal, found in /Applications/Utilities/ and type the following command (followed by enter): sudo nano /private/etc/hosts

You’ll be asked for your password, but that’s OK. Copy and paste the result in a reply to this topic. Afterwards you can quit Terminal (type ctrl-X first).

What DNS are you using for the WiFi connection? Check both your device network settings and the router internet settings.

BTW, it works for me using the ISPs DNS. Looks pretty innocuous. When does the server stop responding? After you login, maybe?

If site is malicious avoid viewing it .

An apple article is there : Non-responsive DNS server or invalid DNS configuration can cause long delay before webpages load - Apple Support

Its a problem with your WiFi. I can get to the site fine using WiFi on my Phone, LTE, MacBook Pro, and Windows PC.

While connected to WiFi, can you access www.cheapjoes.com site by IP address (207.32.177.149)? If you can, that's one good indication that your DNS is messed up.

Did you try to use google public dns IP addresses? Look for DNS under wifi settings. Manually enter 8.8.8.8 and 8.8.4.4

Never mind. I can't access 207.32.177.149 either. Try editing your Mac hosts file to include:

206.190.36.45   www.cheapjoes.com

Retry accessing the site after saving the hosts file. If you can access it, DNS is the source of the problem.

You said the DNS was the same IP address for both. Could you tell  us what that address is? It might have something to do with your problem.

Thanks. That's an IP on your local LAN. Are you running a nameserver on that computer? Or, if that's the IP of your router, what is the DNS IP in the router internet settings, where it shows the connection to the ISP?

Is 192.168.0.186 your WiFi router? If it is, the router is doing name resolution using whatever is in its DNS settings or whatever DNS IP addresses the router receives from the ISP.