ACK! The TMG firewall service won’t start! You check the event viewer and you see what you were hoping not to see – the configuration database is corrupt. Ug. Now what? Well, maybe you have a backup and maybe you don’t. If you don’t , try what is recommended in article and cross your fingers 🙂
http://www.fastvue.co/blog/how-to-recover-forefront-tmg-from-a-corrupt-configuration-database
HTH,
Deb