Blocking ultrasurf

[ricardoinforuol.com.br]

Hello I wonder if their friends already have encountered a user wearing a smart program called ultrasurf, I wonder how I can make to block the use of this feature on my network. I count on help from friends!

[keeper 0]

We also encountering this problem  :'( :'( :'( :'( :'( :'(

but no luck to block it