Web Proxy 3128 - Not Working on Other Subnets

Question

I've successfully installed and configured the application as a bridge and it's filtering and reporting nicely. My network has several vlans. I can connect to the proxy on 3128 from a non-vlan address, but I can't connect from a vlan address. The vlans, DHCP, etc. are all handled by other network gear.

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mark57165 · Accepted Answer

The main reason I’m using this in bridge mode is because I like the router I’m already using on this network and want to keep it. 
 My solution to this was to enable another port on the device, connect it to the network as a “client,” and add all the VLANs to it. Everything that wasn’t working seems to be working fine now.