This article was previously published under Q329807
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Microsoft Internet Security and Acceleration (ISA) Server 2000 does not support having domain members or domain controllers in the perimeter network that belongs to a domain on the internal network behind ISA.
Domain or inter-forest trust relationships between a domain or forest in a perimeter network and a domain or forest on the internal network behind ISA are also not supported.
This applies to both back-to-back and three-homed perimeter networks.