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Site-to-Site IPSEC VPN tunnel cuts out and goes up several times per minute without complete disconnection

Hello,

I have a Site-to-Site ipsec VPN that connects normally, but several times people tell me that it cuts out and doesn't work for a few seconds.

Looking at the logs I found this:

SYSTEM 2021-12-26 07:15:42 IPSec Terminated Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-2 terminated. (Remote: xx.xx.9.54) 17802 SYSTEM 2021-12-26 07:15:42 IPSec Terminated Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-1 terminated. (Remote: xx.xx.9.54) 17802
SYSTEM 2021-12-26 07:15:42 IPSec Established Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-2 established. (Remote: xx.xx.9.54) 17801
SYSTEM 2021-12-26 07:15:42 IPSec Established Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-1 established. (Remote: xx.xx.9.54) 17801
SYSTEM 2021-12-26 07:12:22 IPSec Terminated Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-1 terminated. (Remote: xx.xx.9.54) 17802
SYSTEM 2021-12-26 07:12:22 IPSec Terminated Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-2 terminated. (Remote: xx.xx.9.54) 17802
SYSTEM 2021-12-26 07:12:22 IPSec Established Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-1 established. (Remote: xx.xx.9.54) 17801
SYSTEM 2021-12-26 07:12:22 IPSec Established Intya_Second-1 - IPSec Connection Intya_Second-1 between xx.xx.9.54 and xx.xx.6.243 for Child Intya_Second-2 established. (Remote: xx.xx.9.54)

If I manually turn off the VPN, I get different information and get an email notification.

During the cuts that users announce to me, I do not receive any notifications.

Where can this cut problem come from?



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