dropped by fw_tcp_state_verification Reason: SYN on established conn response

[Yatiraj_Panchal]

Hi All,

We are getting below error intermittently. 

dropped by fw_tcp_state_verification Reason: SYN on established conn response;

Gaia OS: R80.10 on gateway and management server both. 

Please give me the reasons behind this issue and please check screenshot for the reference. 

Thank You, 

[Tal_Paz-Fridman]

From similar cases I found it seems that he the message "Dropped by fw_tcp_state_verification Reason: SYN on established conn response" is because the Security Gateway received SYN packet on the connection that already existed, so when it was resent the SYN packet was dropped.