A Look Under the Hood

Unlike farm solutions (which run in the IIS worker process), sandboxed solutions run in the sandboxed worker process (SPUCWorkerProcess.exe), which is a restricted execution environment. Each sandboxed solution runs in its own application domain within this process. The sandboxed worker process can run on only those servers in the farm that are configured to run the Sandboxed Code Service (SPUCHostService.exe), also called User Code Host Service. Using Central Administration, farm administrators can configure to run this service either on all servers in the farm or only on a subset. The sandboxed worker process is associated with a special proxy process SPUCWorkerProcessProxy.exe that runs in full trust and is managed by ...

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