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First Packet Isn't SYN drop

I am new to Checkpoint firewall and have been dealing with "First Packet Isn't SYN" issue for the last few weeks. This is happening between interface and one of application server, both server communicate on port 4000. The odd thing I see only first 3 packets are dropped then the 4th allowed to get through.

 

At the moment, I only have access to logs only, not configuration. Any configuration changes need to be communicated with other team.

Anything place I can start to troubleshoot the issue?

 

 

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