Connected to 192.168.1.10 Port 9999
Negotiating SSL/TLS session...
SSL/TLS negotiation successful...
SSL/TLS connection using cipher DES-CBC3-SHA (168 bits)
220 ioFTPD [www:
http://www.ioftpd.com] - [version: beta 4] server ready.
USER ioFTPD
Works here as supposed to.. are you sure that your .pem file is correct? Paste your config line for ftp service here, if this answer didn't help you