PORT fallback from PASV

Question

Once a FTPClient establishes a connection, is there a way for it to check if the server supports PASV and fall back to PORT otherwise. I've had an issue where one FTP server (MS) when establishing a PASV PUT, just ends up disconnecting me everytime because it does not support PASV.

Thanks!

Answer 1

Does it throw an exception during the put?

If so, you could catch the exception and attempt to retry the put, first setting the mode to PORT.

Once a FTPClient establishes a connection, is there a way for it to check if the server supports PASV and fall back to PORT otherwise. I've had an issue where one FTP server (MS) when establishing a PASV PUT, just ends up disconnecting me everytime because it does not support PASV.

Thanks!