There are some websites that I have been unable to access. They display "Server not found" in my firefox, error 137 in my google Chrome. Even my iPad and my MacMini are unable to access these sites for some reason.
However, when I connect to a VPN or using other wifi hotspots or internet connection these sites are accessible without any problems. I have a router installed but all the settings are in the factory default setting. The only thing I changed are the SSID and password
I tried running virus and malware scans but nothing comes up... Wondering if it is error on the web site servers or due to my ISP?