"Remote name could not be resolved" error usually means that the DNS (domain name server) server(s) currently in use by your router or computer has a problem. In other words, it generally means that something is preventing the web address you are trying to reach from resolving into an IP address so your computer can reach or find it.
There could be any number of problems causing this error; from issues with your router or modem, to an issue with the DNS itself.
Restarting the modem and router
To solve this, start by restarting both your modem and router. Power both devices off; wait 30 seconds; then power them back on. Finally, try again.
Flushing the DNS cache on your computer
The following steps involve working with the command line on your computer. We highly recommend consulting with an IT support professional before attempting this remedy.
In windows search for cmd, and when the cmd.exe program appears, right click and Run as administrator.
When the command prompt window opens, type:
...then press Enter to purge the DNS resolver cache.
Finally, reboot your computer.
Are you using a proxy server?
It may be possible your computer might be using a proxy server that is preventing direct access to the IP address, or else changing the information that passes through it's servers so that the final address cannot work or respond properly. Sometimes ISPs will use this to throttle and control traffic or save bandwidth during times of heavy traffic, or simply to slow things down for certain service levels or after a certain volume of traffic, however they often create problems for users, such as slow browsing and inability to connect to some secure servers.
If so, you might see if you can temporarily turn it off so your computer can directly access the internet instead:
Click Start > Settings > Control Panel > Internet Options > Connections tab > LAN Settings, and uncheck all boxes (proxy and auto detect).
Still not working?
If you've tried the above but still encounter issues, consult with your internet service provide or a IT support professional.