I configured IPsec Site to Site VPN between two Sophos Firewall Headoffice and DR site.
On DR site DR Sophos XG135 behind Sophos 230(wan to lan rule configure without any restriction).
VPN was working but all of sudden It stop working and I found middle Sophos blocking VPN traffic.
It shown on log Denied souceHeadoffice_WAN_IP:ESP(0) to DR_WanIP:ESP(0).
Anyone have idea what is ESP(0) and why it blocking?
Note:
LAN to VPN, VPN to LAN and WAN to LAN rule is configured on all firewall and it was working before.
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