You can 100% confirm if a proxy is blocked from a website by following this guide. 

 

First, you should ensure that your proxies are setup properly, and that you are using the correct port, or username/password for the proxies with the article HERE

Once you've completed that, you will be able to proceed below. 

 

There are two methods. One with Chrome, and one with Firefox. Please follow the method that applies to you. 

 

Chrome:

Open Chrome, and click on the 3 dots in the upper right corner HERE

Select 'Settings' in menu HERE

Scroll to bottom of Settings page, and select 'Advanced' HERE

Scroll to bottom of Advanced section, and select 'Open proxy settings' HERE

Select the 'LAN settings' button on next window HERE

You will then click the checkbox stating 'Use a proxy server...' HERE

You may then enter your proxy IP, port, and click OK HERE

To confirm that your proxy is loaded into the browser, go to google and type 'my ip'. The proxy IP should show HERE

If your proxy IP shows up in google, you can then try loading your preferred website. If it loads, then your proxy is most likely not blocked. 

*To remove proxy, just reverse the steps above. 

 

We have a video showing how to complete this with IP authorization HERE

We have a video showing how to complete this with Username/Password authorization HERE

 

Firefox:

Open Firefox, and click on the 3 bars in the upper right corner HERE

Select 'Options' in menu HERE

Scroll to bottom of Options page, and select 'Settings' HERE

On next window, select the 'Manual proxy configuration bubble' HERE

You will then enter the proxy IP into the HTTP Proxy area 

Then enter the proxy port into the port blank HERE

Make sure this box is checked 

To confirm that your proxy is loaded into the browser, go to google and type 'my ip'. The proxy IP should show HERE

If your proxy IP shows up in google, you can then try loading your preferred website. If it loads, then your proxy is most likely not blocked. 

*To remove proxy, just reverse the steps above. 

 

We have a video showing how to complete this with IP authorization HERE

We have a video showing how to complete this with Username/Password authorization HERE