06-20-2017
What OS's are the client and server?
Has the network topology changed at all concurrent with the change of ip address?
I would be thinking that somewhere on the route the required payload is not allowed. Connecting the FTP session is achieved with quite small packets but as soon as you attempt to do anything else, the payload will radically increase. If devices have different maximum payloads configured then packets are denied, ie, lost. Timeout would result. I also wonder whether one device is trying to open a different port at that point which is denied.
I'm still thinking about this one. Strange!
---------- Post updated at 09:24 AM ---------- Previous update was at 09:20 AM ----------
Using PASV as suggested by rbatte1 is the most common resolution of such problems but the ports used in passive mode need to be open too.
Are you using the native ftp client and server implementations from your OS's? Or are you using a third party variant?
Last edited by hicksd8; 06-20-2017 at 05:34 AM..
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netrc(4) Kernel Interfaces Manual netrc(4)
NAME
netrc, .netrc - Specifies automatic login information for ftp
SYNOPSIS
$HOME/.netrc
DESCRIPTION
The .netrc file contains the information used by the automatic login (autologin) feature of the ftp command. It is a hidden file in your
home directory and must be owned by the user logging in, or by the root user. If the .netrc file contains a login password, the file's
permissions must be set to 600 (read and write by owner only).
The .netrc file can contain the following entries (separated by spaces, tabs, or newlines): Where host is the name of a remote host. This
entry begins the definition of the autologin process for the specified host. All following entries up to the next machine entry or the end
of the file apply to that host. This is the same as machine, except that default matches any name. There can be only one default token,
and it must appear after all machine tokens. This is normally used as follows: default login anonymous password user@site The preceding
command line gives the user automatic anonymous ftp login to machines not specified in .netrc. This can be overriden by using the -n flag
to disable autologin. Where user is the username to use at the remote host. If this entry is found, the autologin process initiates a
login using the specified name. If this entry is missing, the autologin process fails. Where password is the login password to be used.
The autologin process supplies this password to the remote server. A login password must be established at the remote host and that pass-
word must be entered in this file, or the autologin process fails and you are prompted for the login password. Where password is the
account password to be used. If this entry is found and an account password is required at the remote host, the autologin process supplies
the password to the remote server. If the remote host requires an account password but this entry is missing, the autologin process
prompts for the account password. Where macro is the name of an ftp subcommand macro. The macro definition starts on the following line
and is defined to contain all of the following ftp subcommands up to the next blank line. If the macro is named init, ftp executes the
macro upon successful completion of the autologin process.
FILES
Contains automatic login information.
RELATED INFORMATION
Commands: ftp(1). delim off
netrc(4)