I was reading about this and on websense site they talk of multiple ways to block Tor but they also mention that Tor sites registered are around 1300 so at the firewall I don't believe that regex level will help. I am going to check with CSC module that does URL filtering over HTTP/HTTPS sites.
5540 by itself cannot block Tor based on the fact that it works over HTTPS and ASA has no inspection for HTTPS, if you have a CSC module on the ASA that could drop it but it seems that you should be reaching out to websense since they should be able to block HTTPs as the firewall can do HTTPS redirects to Websense filter.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...