Check the HA link speed. The UTM will set the MTU to 2000 if the link speed is not 100 Mbit/s. If the link speed is 100 Mbit/s, the UTM will set the MTU to 1500. For Cisco switches: Set the keepalive off on the Cisco side. If auto-negotiation is turned on, check if the auto-negotiation results to 100 Mbit/s full-duplex. Sophos UTM (formerly Astaro Security Gateway) offers an integrated software solution that provides superior performance in an all-in-one firewall. Its hardened operating system, stateful packet inspection, content filtering (virus & surf protection), application proxies and IPsec based VPN provides a powerful solution to today's security issues. Pingback: Sophos UTM Home - Software Appliance - x86 - blog.chris-x.de. March 2016 at 15:28 it worked for me thanks!!!!! Sophos provide a USB installation option called the Smart Installer for UTM hardware appliances, but this is a special USB drive that emulates a CD, essentially working around the issue. This article steps you through the process of preparing and creating your own Sophos UTM bootable USB installation drive.

Sophos Full Guard Bundle include the operating system and all security applications within a single software image. While offering the same capabilities as the hardware platform, they can be easily installed on your hardware of choice - max deployment flexibility.

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'Users' includes workstations, clients, servers, and devices that communicate through the firewall to reach the Internet. It also includes VPN connections from remote VPN clients ('road warriors') and from remote VPN gateways (each remote gateway counts as one user)