I dont know for sure where we start the troubleshooting if its in the firewall or on the SBC.
Let say this our IP Address that we used.
126.96.36.199 - Public IP (Nat IP)
192.168.1.113 - Forwarding IP (B1)
192.168.1.114 - A1 for Remote Workers
192.168.98.100 - SM100
Here's the diagram.
RW > Internet > Firewall > SBC > SM100
In this case. Once the Firewall received the traffic from the Internet which is 188.8.131.52 it will be forwarded to the B1 and transfer to A1 and then SM100 to get some data.
P.S: I've also installed a certificate from SMGRCA to my mobile phone.
Hoping you could help us on this. Many thanks in advance!