Fetch 3.0.3 Fails to PUT or GET Files Through SOCKS Proxy

Attempting to use the Fetch 3.0.3 FTP client to "PUT" or "GET" files through SOCKS Proxy fails with the following error message if configured to use Port-based connections: "Error number -1"

This error occurs because of a malformed BIND request that the Fetch 3.0.3 client sends to the Proxy Server. When the BIND request is sent to the SOCKS server, the request should also include a destination port. However, with FETCH 3.0.3, a NULL value is sent to the SOCKS server, so the SOCKS server rejects the request and closes the connection.

If Fetch 3.0.3 is configured to use a PASV mode connection to the ftp server going through SOCKS Proxy, Fetch can successfully "GET" files but still cannot "PUT" files successfully.

NOTE: The "PUT" command allows some data to pass through the Proxy Server but it aborts near completion of upload.

Other Macintosh FTP clients are available that make successful BIND requests, allowing the client to use standard Port-based connections (that is, not PASV mode).

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