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IPSec VPN not working before phase 2 negotiation

Hello,

 

I made an VPN Tunnel between paloalto and fortigate(3 tunnels).

 

Every config is same between them. 2 of them work well but 1 tunnel has an issue.

 

About 3 mins before phase 2 negotiation(by lifetime or other reason), traffics can't go through the tunnel.

(I can see traffic logs that incomplete).

 

After negotiation and install sa, it works normally.

 

What should I look? There no error log or fail in ikemgr or system log.

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