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VPN connection frequnt Faild

Hello Everyone, 

My Company Use Sophos XG 210 (SFOS 19.0.0 GA-Build317) .

I  Connect IPSEC VPN Site to Site From Sophos XG210 To Sangfor NGAF.

VPN Connection Frequent Faild 

This is message log :

 - Couldn't parse IKE message from x.x.x.x[500]. Check the debug logs. (Remote: x.x.x.x)


- IKE message (68009AD0) retransmission to x.x.x.x timed out. Check if the remote gateway is reachable. (Remote: x.x.x.x)" 


How to fix it,

Thank you 
Sakchai Saguansubsiri



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