You can clean your temporary internet files (cache/sessions/cookies) by pressing CTRL + F5 simultaneously in your web browser.
If using the keyboard shortcut for temporary internet files removal doesn’t resolve your problem, you can flush the DNS of your computer by executing the following commands depending on your OS.
For Windows 98/NT/2000/XP/Vista/7/8:
Go to “Start” -> “Run” -> type “cmd” -> press “Enter” key -> type “ipconfig /flushdns” without the quotes and press “Enter” key.
The result should be:
Windows IP Configuration
Successfully Flushed DNS Resolver Cache.
If the Name Service Cache Daemon is running then you will need to open “Terminal” and execute the following command:
For Mac OS:
Open “Terminal” and execute the following command:
If you are using Leopard then run this command: