What happened to my DHCP after ISA sp2?
MPECS Inc. Blog: SBS Premium - SBS Post Install ISA Rule Must Do for DHCP:
http://blog.mpecsinc.ca/2007/10/sbs-premium-sbs-post-install-isa-rule.html
Philip's blog talks about the case of the missing DHCP
Amy talks about why this happens:
Why DHCP Stops Working After You Add a Custom Access Rule - SecureSMB:
http://msmvps.com/blogs/securesmb/archive/2007/10/13/why-dhcp-stops-working-after-you-add-a-custom-access-rule.aspx
One of the unusual-ness of SBS is the behavior of rule making on the box it's protecting. This is one side effect we see, and in particular I've seen it pop up post sp2. ISA is very RFC aware and my guess is that with the application of sp2 it's gotten a bit more RFC aware than it already was. But bottom line, watch your rules. I don't have a special DHCP rule here.
Read the complete post at http://msmvps.com/blogs/bradley/archive/2007/10/13/what-happened-to-my-dhcp-after-isa-sp2.aspx