Look in your FTP logs and see what the Wyse is trying to do.
Another trick I use for things like this is to plug the Wyse into a 100mb hub (not switch), connect a PC to the hub as well, then run Wireshark on the PC in promiscuous capture mode. This will give you a nice detailed view of what is going on. This is easiest with a hub because no special configuration is needed, but some switches allow for this as well with some config magic.