Recieved TLS alert from the server: Handshake failed (40)
Solution 1:
I had this issue in ProFTP, and got the same error message in FileZilla. For the same reason as stated, FileZilla have disabled RC4 on TLS connections. You can probably still connect without a certificate check (under Site Manager - Protocol):
Alternatively, and what worked for me, was to give the FTP Server the path to the SSL certificates on your server. It's specific to PureFTP though, so I can't tell you which file to patch - sorry.
This may help though: http://download.pureftpd.org/pub/pure-ftpd/doc/README.TLS