Well, I know I've had to reinstall libnet on pretty much every binary distribution of perl that I've installed (including the default slack install). So you might try that. If worse comes to worse and you really can't get this working, I'm going to suggest a non-perlish solution (I know - blasphemy!) If you drop to a command prompt and type in ftp /? on an NT or 2000 box you will receive the list of switches. One of these switches is to read commands from a "script" (basically just a text file with the proper commands in order). I have made use of this with a batch file and the "at" command to do regularily scheduled ftp's.

But really, try and reinstall the libnet module, there will be a prompt during that process for ftp, and I'll be you can get it working through that.