Developer Guide for Intel® SDK for OpenCL™ Applications
If you receive a "Protocol error" message, you need to change your firewall settings or change the debugging port in the Intel® SDK for OpenCL™ Applications - Debugger plug-in for Microsoft Visual Studio* IDE.
The default debugging port is 56203.
To change the debugging port number for the CPU or GPU system, do the following:
If the Use Custom Port check box is unavailable, switch to the Basic Settings tab and check the Enable OpenCL Kernel Debugging check box.