Ftp client question

Hi all,
I'm writing an easy ftp client.
I have a problem when sending ABOR command after a GET.
After sending the command the client waits on control connection for 426
server message (Data transfer aborted), but server doesn't send anything
on the control connection (I have tried also using Telnet synch signal).
The only way to get an answer is to close the data connection socket:
after that the server closes the connection too, but this does not
follow the RFC 959.
Any suggestions?

Thx

Ps Sorry for my bad english