Seems the method of using certificate-based connection won’t work with non-Sophos firewall.I had to switch to shared-phrase in order to make it work.Not sure if that problem is due to old firmware/device on the other side or is it compliance issue. However, I had to go on the VPN settings on both firewalls and make … تابع قراءة Sophos XG Site-to-Site VPN with Other FW Failed