I'm going to install Sophos UTM 425 in bridge mode for using only the web protection module in transparent mode, but it has to be behind two Cisco ASA that both are configured in active/passive. I don't know if Sophos UTM will work by connecting it between the two ASA and the switch and the hot standby of both ASAs, because both ASA have to connect their interfaces active and passive to the utm and from the utm to the switch.
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