i'm using pix firewall and using it as a firewall and as a proxy server, the problem is that i can't block the web access from the clients that installed on their pcs a program named ultrasurf , this program changes the web proxy setting in the internet options of the clients pcs to 127.0.0.1:966 even if i required from them to use my proxy ip and the port 8080 or 80, that program change these settings to 127.0.0.1:9666 so how please to control that by pix firewall rules, thanks alot for your response and help
Re: how to block ultrasurf traffic on cisco firewall
FWSM is a firewall that has a connection based operation. All it sees are connections passing through. It's not possible to look into the payload since UltraSurf encrypts the traffic. Any SSL packet passing through the firewall can be a potential UltraSurf packet. But you can't just block all TCP 443 because many secure connections relay on this protocol.
There is nothing else the FWSM can do to block UltraSurf. Based on Cisco documentation, all it can do to try to block it is the use of ACLs.
In order to have an efficient action over UltraSurf you need advanced encrypted content engines analyzers (like an ACE module that can look into encrypted payload).
BenefitsDocumentationPrerequisiteImage Download LinksLimitationsSupported PlatformsLicense RequirementsTopologyStep-By-Step ConfigurationConfigure Virtual ServiceActivate the virtual service and configure guest IPsConfiguring UTD (Service Plane)Configurin...
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
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...