Firebox giving unwanted DDOS alarms

I have two subnets A and B connected together with Branch Office VPN. In network A I have clients needing to connect with https/http to a server in network B.

When I type the address in browser in network A to connect to Webserver in network B page starts to open and hangs.

I do not have a proper certificate in the webserver and the connection must be switched to http by pressing advanced button in Edge.

At the same time I get an alert from Firebox in network A:

Alarm ddos_attack_src_dos generated by device Firebox.xxx.local: DDOS from client 10.30.1.110 detected.

10.30.1.110 is the client running Edge trying to connect to 10.50.1.114 port 80

I suspect that this alert means that Firebox has halted the connection.

Is there any way to get this working?

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