The SMC RAKP web option is used for SMCIPMITool only. It uses different RAKP algorithm other than the standard. SMC RAKP needs to be disabled before using IPMIView.
If you cannot connect to BMC via standard way (RMCP+), please try to update the latest firmware and reset to factory default. In most cases, we found that IPMIView cannot login to BMC. This is caused by an old firmware which has a bug in SMC RAKP option.