Filezilla and SSL FTP

[Mrohs, Ray]

We have been using Filezilla 3.0.3 for SSL file transfers between
Windows and z/VM 5.2. More recent versions of Filezilla, 3.0.4 and
beyond, no longer work. Sessions drop during the first few packet
exchanges, and before the certificate gets displayed or user
authentication. Before we go into debug mode, has anyone else seen/dealt
with this?