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When downloading data over FTP, is it necessary to issue a PORT command before each RETR, or would it be legal to

PORT 165,82,22,48,133,72
RETR /1.txt
RETR /2.txt
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up vote 0 down vote accepted

The answer is yes. (example is not legal)

< PORT 165,82,22,48,133,72
> RETR /1.txt
> RETR /2.txt
< 425 Use PORT or PASV first.
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