How to block an anonymous ftp user?

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# 1  
Old 04-10-2008
How to block an anonymous ftp user?

Could anyone provide information on how to block a specific client machine from being able to log onto anonymous ftp?
# 2  
Old 04-10-2008

which FTP-Server do you use?
Every FTP-Server has a config file, here you can filter every user.

# 3  
Old 04-10-2008
Or if it's a particular IP address, drop it in hosts.deny
# 4  
Old 04-10-2008
Thanks for your quick replies

We are using Redhat Linux.
# 5  
Old 04-10-2008
Another thing

When I use the "last command" the attacking server's ID shows as "can59-4-82-240-1". Can this be used as the IP address in the hosts.deny file.
For example would this work?
ALL : can59-4-82-240-1
# 6  
Old 04-10-2008
That looks truncated. Do you know the full domain name for that?

Many ISPs have a convention to put the IP address in the host name for dynamic (dial-up or home ADSL) users. By that convention, it would look like the IP address for this host would be, or possibly (or maybe even or; but those are not valid / allocated anyway).

Sometimes the reverse DNS is missing, and in that case, using the host name won't work. The DNS lookup will take time anyway, so using the bare IP address is probably more efficient.

If this is a dynamic user, they could come up at a different IP address the next time they reconnect to their ISP.

Have you tried contacting the attacker's ISP, by the by?

whois -h suggests this is in Korea, but if that's the wrong IP address, that's of course just a red herring. belongs to Level 3 / Genuity.
# 7  
Old 04-11-2008
Hi there again.
Well I looked into this and found that the IP address of the attacking client is which is in France, and also got the mail address of the provider. I sent them a mail but no reply yet.

I opened the hosts.deny file and edited it using vi. When I save it using :w! to override the readonly setting, I get a message saying cannot open file for writing. Do I need to edit as super user?
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