I am consolidating a LAN architecture as you can see in the topology attached. I have applied all the required functionnalities as HSRP, M-Spanning Tree, L2 Etherchannel, Trunks and so on. My big problem is that traffic from the Firewall cannot reach devices into the LAN (but can reach device gateway). And traffic in the reverse path (from devices into the LAN to Firewall) is OK.
I am afraid that i miss something, and spent days to troubleshoot it...