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522 FTP Reply Code  -  KB Article #1980

Related Articles --

Example Reply
522 Network protocol not supported, use (1,2).

A 522 reply code may be sent in response to an EPRT/EPSV command which uses the incorrect AF. Valid AFs are 1 for IPv4 and 2 for IPv6. It is a transient negative reply, which means the client is encouraged to reissue the command with a valid network protocol identifier.

Possible Commands
A 522 reply code may be sent in response to the EPRT or EPSV commands.

See Also

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