Blocking internal PC from web access

Hi Guys,

I have an internal PC I am trying to block remotely. I also have a transparent proxy going.

If I block on the forward chain, does port 80 etc get blocked since it’s going through the proxy?

If so, how can I block the computer completely?

If you want to block access to the proxy server so that it can’t even be accessed by manually setting the proxy on the PC then block access to it using input filters.