I blocked related port number but kerio still fails to forbid ultrasurf. Is there anyone solved this problem ?
have a look at the last pages
They say that they blocked it.
(I hope that linking to other sites it's not a violation :p)
Blocking of port 9666 will not help - this is localhost port only. You have to monitor connections to port 443. There is Brazilian Linux script for blacklisting ultrasurf servers using iptstate (can't find it at the moment) - but in my case it was enough just to block packets to destination network 22.214.171.124/18 with destination port 443.
Here is another way to block -
Article from Symantec is on using hash to prevent ultrasurf application from running.
Another article on blocking based on object footprint.