Some of the websites are blocked due to the entries created in the SafeSquid configuration. We don't know which security filter is the reason for blocking. We need to identify the filter and based on that create the new entry to allow the blocked website or you can modify the existing entry. 
   Prerequisites
   You must know the different types of security filters available in SafeSquid.
   
   Finding the reason for blocking
   You can find the reason for blocking by using two ways 
   
   
   Profiles
   If the website is blocked with Access profile rules you should get the SafeSquid blocked template and 403 status code.
   Read more about Provide_Access_To_The_Block_Listed_Website
   Text Analyzer
   If the website is blocked with Text Analyzer you should get a SafeSquid blocked template and 403 status code.
   
   Image Analyzer
   Image Analyzer blocks the inappropriate images by using their Threshold score.
   Read more about Unblock the website which is blocking with image analyzer
   Cookie filter
   The cookie filter blocks the logins to the websites.
   Read more about Unblock the website which is blocking with cookie filter
   Elevated Privacy
   Elevated privacy blocks third-party cookies.
   Read more about Unblock the website which is blocking with elevated privacy
   
   
   SSL errors
   Read more about Unblock the website which is blocking with SSL errors