A client needs needs needs needs replace their TMG.
Can a Cisco ASA firewall fully replace a TMG?
Can an ASA be used as a proxy?
If not, is there any firewalls out there that can replace TMG in its entirety?
Thanks in advance
Cisco ASA Next Generation Firewall can actually replace a TMG .Additional capabilities, including Application Visibility and Control (AVC), Intrusion Prevention (IPS), and Web Security Essentials. Here is the link http://www.cisco.com/c/en/us/products/security/asa-next-generation-firewall-services/index.html
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ISA/TMG Firewall is irreplaceable by a hardware Firewall, specially for spoof detection. Having both security solution is a good idea. However, hardware/Firewall security as initial line of defense on your network is recommended.