What are Difference between an Isolated host and an In Process host

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Question - What are Difference between an Isolated host and an In-Process host?

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The difference between an Isolated host and an In-Process is that an Isolated host must run under another process, in most cases IIS, and an In-Process host is a complete BizTalk service alone. Additionally, since In-Process hosts exist outside of the BizTalk environment, the BizTalk Administration Tools are not able to determine the status of these hosts (stopped, started or starting).
Security is also fundamentally different in an Isolated host versus an In-Process host. In-Process hosts must run under an account that is within the In-Process host’s Windows group, and do not maintain security context within the Messagebox. Isolated hosts are useful when a service already exists that will be receiving messages either by some proprietary means or by some other transport protocol such as HTTP. In this case, the Isolated host only runs one instance of the End Point Manager, and is responsible for receiving messages from its transport protocol and sending them to the Messagebox through the EPM.

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