Please make sure the setting of driver signing is set to default from your Windows Start menu: Control Panel → System → Hardware → Driver Signing
    

01.The Windows Firewall installed in your computer blocks the connection If no MFP server is found, please make sure the Windows Firewall or any third party firewalls have been disabled or bypassed and click the Search button to try again. 02.The IP address segment is different between computer and MFP server. Change the default IP address (192.168.0.10) of MFP server to match your network segment by Web management. If you changed the default IP address and forgot it, please refer to the above section about the Load Default Setting. To make sure the default IP address of MFP server is restored

The last upgrade process was not completed. The MFP server must be upgraded again.