Upgrading to MR7 will break your connection to Central Management. When you upgrade the firmware, it will switch your management to CFM (Sophos Central Firewall Manager) which has no options whatsoever. Your log files will be swamped with errors "Failed to send heartbeat from device to SFM"
This has been confirmed as a bug by Sophos at their end (in the cloud), yet it was not fixed in MR8 and they don't appear to believe it is a priority nor fixing it anytime soon.
We made the mistake of pushing out the firmware upgrade to more than 50 devices by the firewall manager and this has broken the connection across the board, meaning that we will now have to log in to each device manually, switch SFM and put in manual details under Sophos consider this a priority and fix it, at which case we will need to log back in to them all again and switch it back to CFM.
Warning to everyone not to upgrade to MR7 if you use Central Firewall Manager.
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