It's probably because your host has some setting on the server that is preventing a FTP connection between the server and Google.

This is typical of:

1. Cheap 'n Nasty webhosts who are too mean to invest in decent equipment and software.
2. Inexperienced buffoons pretending to be webhosts.
3. Paranoid webhosts who don't understand how to set up proper security, so throw everything into the mix, hoping that some of it works.