Does reverse proxy work with ArcGIS Server 9.3 when using ISA Server?

YES.

Currently ESRI is only supporting ArcGIS Server 9.3 and Apache for reverse proxy. Over the past few days, I was able to use Microsoft ISA Server 2006 Enterprise Edition as a reverse proxy to allow external users to access the ArcGIS Server. The best part, we used forms based authentication and Active Directory. The external customer comes in, autheticates to the ISA Server using AD credentials, and if successful those credentials get passed on to ArcGIS Server. The communication side works like this. User comes in on port 443 SSL, ISA server communicates with the ArcGIS server to a user specified port, we setup 443, but it will work with say 444, for more security you change that port. The reverse proxy solution is the most secure way to allow users from the external side to access the internal resource.

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