I am using a pa-500 as just a web proxy, I have clients sitting in different vlans connected to a ASA5512 that is acting as the router/FW and has DHCP Relay setup and was working fine. I added the PA500 between the ASA and the other network as a web proxy, since then DHCP has failed to work. The PA 500 is running in wire mode
Test by creating a security policy and allow application dhcp from any to any and if that works then check the logs and make that security policy more specific.
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