ZyWall USG2000 FW 3.30(AQW.7)C0 gets "Unable to connect ZySH daemon", WebGUI won't work

FW upgrade to 330AQW7ITS-WK48-r74988.bin over ftp was a simple job, it turned out, and most successful.

WebGUI and all works like a charm, now.


Now we need to modernise:

A router that can manage online gaming, VoIP for ip telephony and multiple ISPs and be future safe for a minimum of 10 years, for a max of 400 subscribers with 4000 maximum separate intenet clients doing everything all the time with no willingness to accept many more problems now.
And must be able to route a minimum of 2Gb/s consistently.

And it MUST be a HA pair so one can upgrade firmware and service HW w/o any downtime except in case of major disasters.

Suggestions welcome!