My proxy not block youtube some computers

[thanhlangso]

I'm setting proxy squid+squidguard and filter https to block facebook and youtube.
My lan network has about 200 computer. Facebook is block good for all computers.
But Youtube is not. some computer is block and some computers is not, still can viewe youtube.
I don't why? My proxy is transparent and SSL/MITM Mode: splice all.

[KOM]

There must be a domain involved that you aren't blocking. If you see them watching YouTube, check Squid's access log to see where they actually are going.