I found out that on his computer, setupVPN was installed as chrome extention. so when it is used, I can access youtube. even I checked the block Block proxy, VPN, TOR, the VPN still can make the connection and bypass the calendar that limit the time for youtube.
I checked the logs ang found out dyn-217-64-127-91-b283.diltwo.com. looks like it is a vpn connection.
