how to solve [this site can t be reached the connection] this error?

In general, the problem may happens for failing on DNS lookup . DNS is that network address that translates the website name to its internet address. Most often it causes for not getting the internet connection or misconfigured internet or network settings. Another reason could be the firewall preventing Google Chrome to load the webpage. In most cases  Flush Your DNS Cache is solve this problem:

Code:

sudo killall -HUP mDNSResponder

Once the command is executed, OSX will prompt for the administrator password as confirmation to proceed. Also, here are some other possible solutions for This Site Can’t Be Reached, these solutions will try to minimize or remove the error completely and takes you to your desired website in your Chrome browser.

• Restart Your Internet Connection
  
• Clear browser cache, history and cookies
  
• Reset Chrome browser settings
  
• Reset Wi-Fi Modem
  
• Restart DNS client
  
• Change IPv4 DNS Address
  
• Reset the Chrome profile Sync
  
• Remove browser extension from Chrome