Dynamic CRM Sandbox Service

The Sandbox Processing Service is part of the CRM deployment and is responsible for executing plugins that are registered in isolation mode. 

Here are some of the limitations of a plugin running under Sandbox.

• Access to the file system (C Drive)
• system event log
• certain network protocols
• registry
• You cannot access any other DLL’s
• IP addresses cannot be used
• Only HTTP and HTTPS protocols are allowed.
• In isolated mode, you cannot call any external DLL’s\DLL’s in the GAC
• It has a timeout for 2mins of the operations.

Other Key Notes:

Debugging a Sandbox plugin is the same as we do when referring a plugin on a database for an online CRM instance, but for On-Premise you need to attach your debugger to the Sandbox service.

Refer here for knowing about - Dynamic CRM Asynchronous Service