topic Re: Change FTP port in Operating System - Linux

Change FTP port

Ana Ramirez — Tue, 27 Sep 2005 10:54:35 GMT

Hello all the people!!!!
I have a questin that may sound simple for you, I started 2 months ago in UNIX, and I would like to change the access port from 21 to xxxx. Anyone know how to accomplish this? Thank you very much in advance.

Re: Change FTP port

Ivan Ferreira — Tue, 27 Sep 2005 11:05:21 GMT

Why do you want to do that. It a port scanner may find out your new port.

Anyway, it depends of the ftp server, in VSFTPD, you have the listen and ftp_data_port directive in the configuration file.

Re: Change FTP port

Steven E. Protter — Tue, 27 Sep 2005 11:05:58 GMT

Hello to you Ana

http://www.cae.wisc.edu/site/public/?title=linbegin

http://www.informit.com/articles/article.asp?p=20665

first link advises against this course of action.

The second link advises how to do it.

SEP

Re: Change FTP port

Alessandro Pilati — Tue, 27 Sep 2005 11:13:30 GMT

Have you inetd or xinetd?

You can Change the port in /etc/inetd.conf of service ftp and restart inetd, or
if you have xinetd you can
create a new service in /etc/services,
create a file in /etc/xinetd.d/ that refers to the new service created /etc/services,
then restart xinetd ( service xinetd restart )

Regards,
Alex

Re: Change FTP port

Ana Ramirez — Tue, 27 Sep 2005 11:17:56 GMT

Thanx Ivan, Steven...

For security (rules here in mi work that I don't understand...)I have to blocked port 21, but I need another port in order to have a proxy conection... that's the reason that I need to add another FTP port, but it dosn't be port 21

Alex, I have inetd, I'm working on UNIX v11.0

Thanx a lot to all, I'm going to prove all your recomendations...

see you soon boys!!!!

Re: Change FTP port

Steven E. Protter — Tue, 27 Sep 2005 11:35:34 GMT

Use sftp

openssh server is secure, runs on port 22.

Client is built into all Linux machines and there are good free ones for Windows.

Be secure, don't use ftp. ftp does clear text authentication. That means your passwords fly across the network without the benefit of encryption.

SEP