I have a library (dll) access to a COM port (usb) which econtrola a mechanism. the issue is that when I use it from a WindowsForm application, I can access the DLL's instructions without problems, that is, it works correctly, but when this DLL uses it from a WEB MVC application, it falls down without delivering any kind of exception. I read from there, that from the WEB applications, which are hosted in the IIS express in my case, it is necessary to make certain changes in the configuration, since this prevents access to the hardware of the machine. Does anyone know anything about these configurations? or what is necessary to do to make this work? Greetings and thanks for your time