It may be unrelated but looking at the change log for filezilla client shows "Compatibility improvements with VMS and z/VM servers". This may or may not have anything to do with your problem. From what you said however, it sounds like you are having some sort of certificate problem.
Aria. On Wed, 28 May 2008 14:23:33 -0400 Mrohs, Ray said: >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? =20 >