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.
RADIUS and Symantec VIP.
I will use screenshots of ASDM, and at the end I will add the required CLI commands. the diagram below show a diagram of the steps the FW goes through when using 2FA authentication:
As you can see in Fig. 1&nbs...
Unable to get signature update from cisco.com
1. Make sure the router can get name resolution. Configure the router with a proper DNS name server.
ISR4451#utd threat-inspection signature update server cisco username xxxxx password yyyyy