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PBSZ FTP command

Updated May 3, 2017


This article describes the use of the Protection Buffer Size (PBSZ) FTP command.


All Serv-U versions


After completing the negotiation of a secure connection with the server, the client must issue the PBSZ command. This command sets the maximum size, in bytes, of the encoded data blocks to be sent or received during a file transfer. The provided parameter indicating the size requested by the client must be a 32-bit unsigned integer. If the server does not support the requested size and requires a smaller buffer, it must respond with an acceptable buffer size, which the client is required to use instead.

Common responses

See also



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