Half Subnet class B port 443 blocked

[Guest]

[jperello]

I'll be pleased if somebody can help me in an annoying situation.

There's a Network configuration
192.168.0.0/23
Main gateway 192.168.0.254
EFW working with iface GREEN in both IPs 192.168.0.4 and 192.168.1.4
EFW iface RED configured to GATEWAY.
EFW with only 1 interface, under KVM (PROXMOX environment)
EFW acting as DHCP server
EFW transparent proxy

So here's the BIG problem
IPs from network 192.168.0.0/24 (hosts configured with netmask 255.255.254.0) can access SSL connections
IPs from network 192.168.1.0/24 (hosts configured with netmask 255.255.254.0) can't access SSL connections

Suspecting from a firewall rule or bug I've disabled any firewall services, but the problem is still there. I've tried too to acces EFW via both IPs of GREEN iface.
It's very important for network administration purposes DHCP clients must be in a pool of network 192.168.1.0, but it lacks of  SSL browsing compatibility, as described before.

Thank you in advance