Although the software can be found on a few websites, its functionality is somehow affected since no official website is provided. The status of the website is known at this time, and various users reported that they've had problems connecting to the online server to download the data. I've seen some that had the same issue as you. From this side, Ugrib appears to be a discontinued product that won't return any time soon. This is definitely the cause to the protocol error you're having since no connection can be made to the server.