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FTP error message: 421 You are not permitted to make this connection

I am unable to get much in the way of substantive answers as to what the following FTP error message might mean:

421 You are not permitted to make this connection

I am trying to connect to a remote FTP machine and as far as I know, my credentials are perfect.  It seems as though the handshake itself fails before it even gets to that stage, though.

Any thoughts are most welcomed.

NY
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newyorkny
Asked:
newyorkny
3 Solutions
 
simonenticottCommented:
Hi,

that error can mean that the server has run out of connections, ie if it allows 5 people to connect simulataneously and there are 5 people already connected the 6th person can get error 421.

If you keep trying you should eventually get a connection, you can use an FTP client like SmartFTP to keep trying every 30 seconds until it manages to connect.

Simon.
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pcavenueCommented:
try to make a link or start this from a run command

ftp://username@server-address

like ftp://ftpuser@32.87.14.9

you should then be prompted for a password

good luck.
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rburns50Commented:
Are you passing through a firewall? If so, make sure you are using a PASV (or passive) mode FTP session- it is supported on most FTP clients. Normal FTP sessions connect to a server, and then the server drops the session and connects back to the client. Firewalls, naturally, have a huge problem with connections from outside. Using PASV mode keeps the session running from cient to server (and not the other way around).
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rburns50Commented:
One more thought (in line with the Simon above)- that error can also mean that your IP address still has a session open to the FTP server, and some FTP servers only allow one concurrent session per iP address. Could someone else be using the same IP address to connect (perhaps you and others are being NAT'd to a single address while going out to the Internet)? Or maybe when you have disconnected previous sessions, you didn't logout properly, and it still thinks you have an open session?
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newyorknyAuthor Commented:
Thanks guys.

It turned out that this error in this case meant that a secure FTP client was required even to attempt a handshake.

I will split the points for the good thoughts.

Have great weekends.
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rburns50Commented:
You too...glad you figured it out
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