I use SecureFileTransferClient an I have the same problem (it worked with Vs 5.2.6)
Log-Snippet:
[10.10.18 11:40:15:712 CEST] 0000003a SystemOut O DEBUG - Setting custom validator to com.enterprisedt.net.ftp.ssl.SSLFTPStandardValidator
[10.10.18 11:40:15:712 CEST] 0000003a SystemOut O DEBUG - Turned server validation off
[10.10.18 11:40:15:713 CEST] 0000003a SystemOut O DEBUG - Created connection #5 [free=0,busy=0,max=3,created=1,cleared=0]
[10.10.18 11:40:15:713 CEST] 0000003a SystemOut O DEBUG - No limit now set on transfers
[10.10.18 11:40:15:713 CEST] 0000003a SystemOut O DEBUG - Setting integrity check to false
[10.10.18 11:40:15:713 CEST] 0000003a SystemOut O DEBUG - Turned server validation off
[10.10.18 11:40:15:714 CEST] 0000003a SystemOut O ERROR - 5:Connect[vftp.vpiroll.local:21] failed
java.lang.NullPointerException
at com.enterprisedt.net.ftp.ssl.SSLFTPClient.enableCipherSuites(SSLFTPClient.java:1181)
at com.enterprisedt.net.ftp.async.internal.ConnectFTPSETask.preConnectConfigure(ConnectFTPSETask.java:229)
at com.enterprisedt.net.ftp.async.internal.ConnectTask.connect(ConnectTask.java:153)
at com.enterprisedt.net.ftp.async.internal.ConnectTask.run(ConnectTask.java:216)
at com.enterprisedt.net.ftp.async.internal.FTPTaskProcessor$b.run(FTPTaskProcessor.java:593)
[10.10.18 11:40:15:714 CEST] 0000003a SystemOut O DEBUG - notifyComplete() called: com.enterprisedt.net.ftp.async.ConnectResult@d64e223b
[10.10.18 11:40:15:714 CEST] 0000003a SystemOut O DEBUG - Connection failed
[10.10.18 11:40:15:715 CEST] 0000003a SystemOut O WARN - One or more connections failed to succeed - disconnecting all
Klaus