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We here require that you secure the communications prior to the logon. There are three modes of FTP
sFTP which is ftp over SSH and not your standard FTP
FTPs which is ftp over SSL. Within this there are two modes, implicit and explicit. Implicit is generally not over port 21 but port 990. Here you connect securely before you can enter any commands.
Explicit is over port 21 and you must request to secure the connection after it is made. That is where the STARTTLS comes into play.
For more info go here
https://en.wikipedia.org/wiki/FTPS
Hope this helps.
Chris Bipes
Director of Information Services
CrossCheck, Inc.
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Versfelt, Charles
Sent: Thursday, November 02, 2017 9:47 AM
To: midrange-l@xxxxxxxxxxxx
Subject: FTP 503 error
Hi all,
Trying to do regular FTP to a site we haven't connected to before.
Testing it manually before setting up an automatic process.
From command line FTP 'the.url' I get the expected "Connecting to... using port 21."
When I enter the user id and password I get this:
503 Invalid sequence of commands (AUTH SSL/TLS required prior to authentication).
Any idea what could cause this?
Thanks,
Charlie
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