it depends on the network configuration. Is proxy involved? Transparent proxy or explicitly defined?
If the tool on your PC is still not able to download data directly, you can download them manually using the web browser.
1. Open the https://mcuxpresso.nxp.com/ and after you select the development board select the Offline data link or you can directly go there via this link: https://mcuxpresso.nxp.com/en/select_config_tools_data.
2. Select the Board you would like to use and download the zip file.
3. Launch the MCUXPresso Config Tools, cancel the initial dialog and select File > Data Manager
4. Select Import... button and using the 'Browse' button navigate to the downloaded archive with the data. Then confirm by the 'Finish' button.
Now the data are imported and you should be able to create a new configuration for selected board or processor.
Config Tools Team