Custom Categorization is not Working

Issues

1. I am trying to add new websites to whitelist or black list category, but it is not updating 
2. Uploaded a new file with some websites and added to specific category, but i did not find that websites in the respective category
3. SafeSquid interface is hanged when I try to add custom websites to any category,

Root Causes

1. Verify the status of Categorization Engine from Statistic page of SafeSquid Interface. 
2. SafeSquid server is unable to contact SafeSquid category server
3. The file(websites) was not uploaded correctly. 

Troubleshooting

Check for connection to category server from your SafeSquid server

Run below command and see below output 

telnet category.safesquid.net 443

Trying 139.59.16.202...
Connected to category.safesquid.net.
Escape character is '^]'.

If the server is not reachable, you have to run below commands and try telnet again 

rndc flush

/etc/init.d/bind9 restart