Need help with bridge in a vm (esxi 6)

Question

I have ESXi 6 with 2 physical NICs (eth 0 and 1) and I have 3 vnics (external, bypass, internal). I have a firewall with eth0 binded to external for Internet access. Then the firewall has a vnic for internal traffic (bypass). I then have sophos utm bridge mode connected to 2 vnics (bypass) inbound and (internal) binded eth1 for lan traffic. 
 modem ---(eth 0 / vnic external) on switch 0 ---- firewall ----- (vnic bypass) on switch 1-------- (vnic bypass) on switch 1 ---utm bridge---- (vnic internal) on switch 2 
 I am not able to pass traffic through the bridge. When I have it set this way, I can access the management page in the sophos bridge. When I switched the vnics in the esxi settings, I can access the page in the middle switch, but not from the lan side. I have tried to ping, tracert, firewall webpage, and dns resolve; nothing has worked to traverse the utm bridge. 
 Settings: 
 bridge status is up / up 
 the bridge has 192.168.0.2/24 (no gw ip) 
 firewall is set for anyip/any service/any ip 
 dhcp relay to 192.168.0.1 (no dhcp on utm) 
 ESXi has promiscuous mode (accept) 
 I have tried with and without a NAT masq 
 the log files for the firewall and http traffic do not indicate the desktop im using is sending traffic to the UTM. 
 
 BTW, I have reviewed the following links to no avail (and several others). 
 https://community.sophos.com/products/unified-threat-management/f/52/t/30313 
 https://community.sophos.com/products/unified-threat-management/f/53/t/34981

DillionPark · Accepted Answer

I figured out my problem, the UTM does not detect a vnic, so traffic would never go through it. What surprises me is that with all the other VM I have and software I have tried it works the way im trying to configure it. Even VMware docs state the 2 devices are on the same vswitch with the same port group, they bypass the nic and communicate directly as the nic is not required. Now I need to figure out how to get the device to work without a physical nic on the middle vswitch. 
 .

**********UPDATE************* 
 
 Check your settings!!!!! 
 I can't believe I overlooked the little stuff. Seems that I should have checked my VM configs as the network adapter was set to on when the VM starts but not connected. I guess when I deleted the previous one, I did not even pay attention to the settings.

DavidPope · Answer

Make sure you're allowing forged transmits and allowing MAC changes on the bypass vswitch as I believe the UTM will be transmitting frames with the MAC addresses of the LAN clients