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Libreswan connection to sophos XG210

Hello everyone, I have been having issues connecting a VPN points together. I have tried everything and still the connection won’t come up. I will share as much information as I can and I hope I can get the needed solution here. 

1) Error I get from the libreswan IPSec side : 

“500 STATE_V2_PARENT_T1 ( sent IKE_SA_INIT request) 

“ pending CHILD SA for “ 

Libreswan config: 

auto=start

salifetime=86400

keyexchange=ike

ikelifetime=24h

aggressive=no

authby=secret

left=public IP

leftsubnet= privateIP/32

right=public IP

rightsubnet= private IP

ike=aes256-sha256;modp1536

phase2alg=aes256-sha256;modp1536

compress=no

pfs=yes

rekey=yes

type=tunnel

The same phase1 & phase 2 connections parameter was also used on the sophos side connection.  The error from the from the sophos side is : 

“Remote gateway didn’t respond to initial service” 

I would really be glad if anyone can advise and give possible support. 

thanks in advance 

Sadiq 



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