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invvalid tcp state and HA failed in active-active setup with LAG in LAN side

Hi,

We have sophos xgs4500 and 19.0.1 MR1 firmware. we configured LAG in LAN side with 2 interface. We have setup both firewall as active-active. After this setup, we are getting invalid tcp state log and some website stopped working. Later on HA keeps getting failed and one firewall become standalone and another becomes faulty. But in firewall display, one showing primary and another is showing standalone. Also firewall keeps rebooting again and again. 

Let me know if someone have answer for this. 

thanks



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