I have reinstalled TMG MBE (Security Server, part of Essential Business Server). The original server had 0x80090005 Bad data errors which rendered the user interface inoperative. The re-installation followed 'Replacement mode' procedure and was installed to different hardware.
Since the reinstallation TMG randomly drops all network connectivity so that it cannot connect to Internet or internal computers. The failure is intermittent and lasts from 30 to 120 seconds, on some days it occurs frequently and on other days does not occur at all. Restarting server reduces the problem but does not always resolve it. Updates have been installed KB967723 fails as it has already been installed.
Further to this problem:
there have also been a couple of 0x80090005 Bad data errors and have restored the server from a Windows backup;
the firewall and other TMG services do not start with the computer, I have to logon and start manually.
We have three users in a remote office, each with a PPTP VPN connection that connect through a single router. The problems seem to have started when multiple VPN connections were created. I am in the process of setting a IPSEC site-to-site VPN and have created it with routing and firewall rules on TMG but have not setup remote router (we are awaiting a new connection at the remote site). I now find that PPTP connections fail when server is restarted and find randomly moving VPN firewall rules and restarting firewall service will resolve this eventually.
The hardware is a Dell R300 with dual core 3.1 Ghz CPU , 4 Gb RAM and Broadcom NIC's. This is within the system requirements. However I cannot find any hardware problems and have updated firmware.