I was using Site to Site VPN between my two Sophos XG firewall which were using SFVH (SFOS 16.05.6 MR-6 firmware. When I upgraded it to new version i.e. SW-SFOS_17.0.0_GA.SFW-80, the VPN stopped working. Though it was showing connectivity between sites but there was no communication between 2 VPN sites. After trouble shooting I came to know that there is compatibility issue between new & old firmware's, and was getting Invalid Major Version. The new firmware supports IKV2 and the old doesn't. I kept IKv1 on both sites but site to site VPN was not working. Snap shot is attached for reference. If possible kindly check whether my findings are correct or wrong. Or I am doing a mistake. Though mistake chances are rare because before upgrading the OS everything was working fine.
Regards
Kashif Iqbal
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