How to block adult website

@tuan2tech  

The logs showing cloudfare CDN which might be the first hop when website has been visit 

Can you paste the entire firewall policy in this post ? 

show full firewall policy 115

Also, what type of the SSL inspection are you using ? Deep inspection or flow based inspection ? 

Do you use application control in the firewall policy ? 

@tuan2tech  

Can you please try the  below method 

1: In the browse address bar, if you are using chrome, type chrome://flags/, find QUIC and disable this flag , use private window and try again from there 

2: I can see you are using the web filter and DNS filter, can you try to use the application control with adult category block and use the deep inspection in firewall policy and try again  ? 

Please create the test policy with single IP address only affecting any production impact

3: If you are using the deep inspection, you might need to install the certificate that apply in the deep inspection to your computer , you can use the default system deep inspection, I screenshot for your reference, download that certificate and install on your test computer root chain to avoid certificate error 

4: If that still not working , right click the adult page and choose inspection , check the network part and refresh the page, download the har file upload here 

Thanks for your help:
1. I did chrome but nothing changed
2. I blocked category both in DNS and webfilter but no success
3. I didn't use deep inspection