Handling ECN in load balancing FortiGate

[aagrafi]

Hello,

We have noticed that when a FortiGate works as server load balancer, when it receives a TCP connection with ECN, it forwards this connection with ECN disabled, e.g.

Client -------------- FortiGate ------- Server pool

---(SYN,ECN,CWR)--->     ---(SYN)--------->               <-- The FG strips the ECN, CWR flags

<---(SYN,ACK)---------      <---(SYN,ACK)---

Do you know if this is how the FG works when doing load balancing, or is there a way that we can enable ECN in the FG?

Thanks