What will happen in case of NAT of the traffic passing through Management network?

According to the Check Point MAESTRO R80.20SP Administration Manual1, NAT is not supported on the management network. If you configure NAT on the management network, the Orchestrator will disable NAT and allow the traffic to pass without translation. This is to ensure that the management traffic can reach the Security Group members and the SmartConsole without any issues.

References

•Check Point MAESTRO R80.20SP Administration Manual, page 291