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LIST command failed: No ports available. [40451]
When the server returns "451 No ports available." in response to the PASV command, it usually means the server does not support passive mode FTP.
In this case, the trace might look something like this:
[p0x000006c4:2013-02-02 14:42:51.679-0400:t0x00000718:Trace]:->- PASV
[p0x000006c4:2013-02-02 14:42:51.842-0400:t0x00000718:Trace]:-<- 451 No ports available.
When this happens, try using active mode FTP. You can do this by changing the appropriate setting in the Site Manager or using the /pasv=FALSE option with the FTPLOGON command.
Article last updated: 2022-01-12
Tags: Passive