Has anyone ever encountered Telex? It looks like kids at schools are using it to circumvent blocks. Is there a way to block it?
You mean this I assume: https://telex.cc
It's obviously going to be very difficult to block since it's specifically designed to work around firewalls.
Looks like it requires an intermediate ageng of some sort to recognise anc divert the telex encoding. Who is doing that for them?
To be honest there are always going to ways around a firewall, to stop this sort of thing you need to be working at the client machine.