Other
Flush the DNS Cache
Step-by-step instructions on how to flush the DNS cache
Flushing the DNS cache can resolve certain connectivity issues.
Search Windows for cmd.
Right-click on Command Prompt when it appears.
Choose Run as administrator.
You may be prompted to confirm this decision. This is normal.
Enter the following command: ipconfig /flushdns
Open the Terminal.
Enter the following command
Terminal
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
Close the Terminal window
It is normal not to get any response to the above command; this is a sign it has been entered correctly.