• This is a very useful website that helps you to detect whether a website you're looking for is actually down or just geo-restricted in your location. 
• It runs multiple proxy servers across the world to check the status of a website. Once confirmed it's up then you can use our next tip to simply bypass or unblock it.
• You will get more information regarding, Why do websites just stop working? by watching the link here.

2) Opera VPN 

• Opera VPN is a free VPN tool that comes built-in with Opera Browser. (FYI: Opera is now based on Chromium Project)
• The main advantage of this application is, it doesn't require any administrative privilege to install it on your computer.
• Users can download and install this application directly from their website.
  
• Once Installed, you can go into the browser's Settings (Alt+P), scroll down to Advanced and Enable VPN.
  
• Once VPN is enabled, you can now bypass the geo-restrictions and able to access the blocked websites with high business criticality.