Help somebody,

I am new to MikroTik and have been trying to block / enable some sites using layer 7. I have found may examples on the web but when ever i try add the filter rule on the Firewall with my layer 7 filter it does absolutely nothing. I must be missing something in all this but i don't know where to start. Its as though the regexp is not working or something but the syntax is all correct. Must i enable something for it to work?

Any pointers welcome please!

on which platform are you testing?
I noticed issues with L7 on CHR. Other platforms work fine.