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site to site VPN keeps going down with a unrecognisable error code IKEv2 SA DOWN. Reason: unknown

flipflop
Level 1
Level 1

Sep 18 2019 03:53:36: %ASA-5-750007: Local:x.x.x.x:500 Remote:x.x.x.x:500 Username:x.x.x.x IKEv2 SA DOWN. Reason: unknown
Sep 18 2019 03:53:36: %ASA-4-113019: Group = x.x.x.x, Username = x.x.x.x, IP = x.x.x.x, Session disconnected. Session Type: LAN-to-LAN, Duration: 1h:02m:47s, Bytes xmt: 227326, Bytes rcv: 284076, Reason: Internal Error
Sep 18 2019 03:54:01: %ASA-5-752003: Tunnel Manager dispatching a KEY_ACQUIRE message to IKEv2. Map Tag = CRYPTO-MAP. Map Sequence Number = 1.

 

Between Sept 1 and Sept 18 this error has appeared 135 times and the VPN tunnel has reestablished back in a few seconds.

 

Cisco Adaptive Security Appliance Software Version 9.8(2)
Firepower Extensible Operating System Version 2.2(2.52)
Device Manager Version 7.8(2)

Compiled on Sun 27-Aug-17 13:06 PDT by builders
System image file is "disk0:/asa982-lfbff-k8.SPA"
Config file at boot was "startup-config"

NC-ASA up 195 days 23 hours

Hardware:   ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores)
Internal ATA Compact Flash, 8000MB
BIOS Flash M25P64 @ 0xfed01000, 16384KB

Please help ASAP. site is facing many issues because of this.

Thanks

 

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