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What is the ABOR command?

The ABOR command tells the server to abort the previous FTP service command and any associated transfer of data. The abort command may require "special action" to force recognition by the server. No action is to be taken if the previous command has been completed (including data transfer). The data connection, if open, will be instructed to close. There are two cases for the server upon receipt of this command: (1) the FTP service command was already completed, or (2) the FTP service command is still in progress. In the first case, the server closes the data connection (if it is open) and responds with a 226 reply, indicating that the abort command was successfully processed. In the second case, the server aborts the FTP service in progress and closes the data connection, returning a 426 reply to indicate that the service request terminated abnormally. The server then sends a 226 reply, indicating that the abort command was successfully processed.

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