Unable to connect to a server from our AIX server via FTP Post: 303044394

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Top Forums UNIX for Beginners Questions & Answers Unable to connect to a server from our AIX server via FTP Post 303044394 by Neo on Thursday 20th of February 2020 08:25:07 AM

02-20-2020

Administrator

Quote:

Originally Posted by Bruno2020

Can you tell me how to open port 20? Do i need to modify anything in the /etc/services file ?

Bruno,

You do not need to worry about port 20 (yet). That line of thinking is leading you off track (sorry Rudi) because you need to establish you have a working route (network connection) between your private IP address space and the Internet. What you are describing (so far) is just a simple network configuration issue.

You cannot ping your ftp host. ping does not use ports. The ping protocol works at the transport layer.

Quote:

There is no TCP or UDP port number associated with ICMP packets as these numbers are associated with the transport layer above.

So, if you cannot ping, you can do nothing (unless ping is blocked by a firewall rule, but then you have other problems, and you are not ready for that yet) .... on any of the ports from 1 to over 65,000 (65,535 TCP and 65,535 UDP ports, to be exact), open or not, LOL. You can open port 20 as wide as a truck and you will still not be able to connect to it; because you have described basic networking issues. You cannot ping at the transport layer (yet).

Since you can ping your own interface (that is good news, at least) , you need to try to ping the next hop on your network (normally your router, but you have not provided a diagram. Please upload a sketch as I mentioned, using the attachment feature of the site, not an external img hosting link).

Do you know what the IP address of your router is?

Also, can you run the arp command on your computer?

Try:

Code:

$ arp -a

That is the next step.... you need to see if you can or cannot connect (ping) the next hop in your network.

You are getting "ahead of yourself" if you try to work / troubleshoot at the TCP or UDP layer before you make sure you are good to go lower in the stack (at the transport layer).

That is why we need to establish you can ping first.

Understand yet? To troubleshoot networking issues, it is best to start at the bottom and work your way up the protocol stack (not the other way around). If you learn to troubleshoot like this, you will find it much easier and much faster to solve problems, I promise.

Neo

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LEARN ABOUT DEBIAN

gftp

GFTP(1) 						      General Commands Manual							   GFTP(1)

NAME

       gftp - file transfer client for *NIX based machines.

SYNOPSIS

       gftp [options] [[proto://][ user : [pass] @] server [: port ][/ directory ]]

DESCRIPTION

       gFTP  is  a file transfer client for *NIX based machines. It currently has a text interface and a GTK+ 1.2/2.x graphical interface. It cur-
       rently supports the FTP, FTPS (control connection only), HTTP, HTTPS, SSH and FSP protocols.

OPTIONS

       You may enter a url on the command line that gFTP will automatically connect to when it starts up.

       --help, -h
	      Display program usage.

       --info Display some information about how gFTP was built. Please send the output of this command when submitting a bug report.

       --version, -v
	      Display the current version of gFTP.

       proto  This specifies the protocol that should be used. It can currently be one of the following options: ftp, ftps, http, https, ssh, fsp,
	      local and bookmark. If omitted, the protocol specified by the default_protocol option will be used.

       user   The username that will be used to log into the remote server. If omitted, your current username will be used for most protocols. For
	      the FTP protocol, the anonymous username will be used.

       pass   The password that will be used to log into the remote server. If omitted, you will be prompted for the password. If  you	are  using
	      the FTP protocol, and the username is anonymous, then your email address will be used as the password.

       server The remote server to connect to.

       port   The  remote port on the server to connect to. If omitted, the default port for the protocol will be used. The port will be looked up
	      in the services(5) file.

       directory
	      The directory to change to once you are connected to the remote server.

FILES

       ~/.gftp/gftprc
	      Per user configuration file. Most of these options can be edited inside gFTP. This file is also commented very well.   ~/.gftp/book-
	      marks
		     Per user bookmarks file.

BUGS

       If you find any bugs in gFTP, please report them to GNOME's Bugzilla at http://bugzilla.gnome.org/

AUTHOR

       Brian Masney <masneyb@gftp.org> - http://www.gftp.org/

								    MARCH 2007								   GFTP(1)