Many thanks for all replys, but no help for me. >Frank, unless an ISA guru knows the solution on here, you could try >reinstalling ISA 2004, and then re-applying SP1 for ISA 2004. Thanks to Danny, but i tried this last week, and it doesnt help. SBS 2003 also no solution, because AD exist in my environment, and the new AD with ISA should join to existing domain. SBS can't join to an existing domain, right? Regards, Frank