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IPSec "Site to Site" VPN connection fails between two Sophos XG Firewall (migrated from Cyberoam CR750 iNG-XP)

We have two Sophos XG Firewall (migrated from Cyberoam CR750 iNG-XP).

One at Head Office and other at Branch Office.

I've configured the PSK based IPSec "Site to Site" VPN connection  between the Firewalls.

Head Office Firewall has been configured with "Default Head Office Policy" and "Respond Only" mode and

Branch Office Firewall has been configured with "Default Branch Office Policy" and "Initiate" mode

Both the connections are active with green Light, but while I try to connect the VPN connection by pressing "Connect" button at branch office firewall, it fails.

I have checked the log at Branch office firewall and it shows that EST-P1: Peer did not accept any proposal sent with message ID: 17853.

Furthermore, I have checked the log at Head office firewall and it shows that EST-P1: System did not accept any proposal received. Need to reconfigure either of the ends with message ID: 17854.

Does anyone can help me to sort out the problem?

Thanks in advance.



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