Hi All, We have an ArcGIS Server providing REST endpoints behind a reverse proxy. We're protecting the rest endpoint and out put directories by requesting a client certificate (DOD CAC) for access. We're also providing a permissive crossdomain.xml file which is also protected by requiring a client cert. We can access everything (service endpoint and crossdomain.xml) after being prompted for and providing a client cert. We can also access the service via a JavaScript API viewer. The problem comes in when we try to access the service via FLEX. We get a sandbox violation when trying to access the service (Error #2048). We never get prompted for the client cert. The error looks to me (ex-.NET dev, current manager type) to come from the ESRI api versus the application code. We did a traffic trace and it looks like FLEX is choking on the "REQUESTCERTIFICATE" piece that the server sends to the client. Thanks in advance for any help you can provide.
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