V4.5 addresses some connection switching issues which might be what you are 
experiencing 

Sent using a virtual keyboard on a phone

> On Sep 8, 2021, at 10:12, Miguel Ponce Antolin <[email protected]> 
> wrote:
> 
> 
> Hi all,
> 
> We are facing this problem, maybe there is any advice you could give us.
> 
> We are configuring two libreswan (v4.4) instances which are going to be a 
> main and a backup endpoints for a Cisco ASA.
> 
> The connection works well when the configured as main libreswan endpoint has 
> ipsec running, but when we test to stop ipsec on this main instance the 
> backup instance do not complete the authentication process.
> 
> We have switched both instances in the Cisco configuration side but, always, 
> the instance configured as main works as expected, while the backup do not. 
> The backup instance has been rebooted, the ipsec service has been restarted 
> and we even tested to switch off the main instance to avoid the possibility 
> of some blocked connection.
> 
> This is the error that appears on the pluto log:
> 
> Sep  7 10:53:27.711642: | processing payload: ISAKMP_NEXT_v2N (len=0)
> Sep  7 10:53:27.711657: | error notification v2N_NO_PROPOSAL_CHOSEN is not 
> supported
> Sep  7 10:53:27.711694: | selected state microcode roof
> Sep  7 10:53:27.711706: "vpn/1x1" #4: dropping unexpected IKE_AUTH message 
> containing NO_PROPOSAL_CHOSEN notification; message payloads: SK; encrypted 
> payloads: IDr,AUTH,N,V; unexpected payloads: IDr,AUTH
> Sep  7 10:53:27.711716: | #4 complete_v2_state_transition() 
> PARENT_I2->ESTABLISHED_CHILD_SA with status STF_FATAL; md.svm=NULL
> Sep  7 10:53:27.711722: "vpn/1x1" #4: encountered fatal error in state 
> STATE_PARENT_I2
> Sep  7 10:53:27.711726: | Message ID: forcing a response received update
> 
> I hope this is enough information, thanks in advance!
> 
> Kind regards
> 
> -- 
> 
> 
> Miguel Ponce Antolín.
> Sistemas    ·    +34 670 360 655
> 
>    ·   paradig.ma   ·   contáctanos   ·              
> 
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