The FTP client and server failed during the negotiation step (also known as the handshake) to protect a data connection with the TLS mechanism.
The command that was being processed failed. FTP continues.
SITE DEBUG=(NONE,ACC,SOC(2))
DEBUG NONE ACC SOC(2)
Try the command again and contact the system programmer with the error message.
If you are not allowed to issue the SITE command to change the server trace options, ask the system programmer to set the options, close the session to the server, enter FTP again and try the failing subcommand.
Use the FTP client and server traces to determine the cause of the error and correct the problem.