This message is generated when the value of the LinkProtocol option does not match any of the indicated values.
Supported values for the LinkProtocol option will be different on different computers and in different versions of the Wolfram System.
Off[message] switches off the message; On[message] switches it on. For example: Off[LinkOpen::linkpl].
Examples
Basic Examples(1)
An error occurs because None is not a valid value for the LinkProtocol option. Evaluation of this input shows the values that are valid in this version of the Wolfram System: