With glftpd sometimes you will see a 'OOP' error instead noop successful. glftpd doesn't allow commands to be sent during a file transfer (you don't see the reply until the transfer completes) and I suspect 'OOP' occurs based on the timing of when the NOOP was sent.
Until I can improve the "send noop during transfer" logic to better to handle these type of errors your only solution really is to disable this option on problem ftp servers.
Some progress has been made to improve this feature but it's still not 100% perfect.
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