07-30-2010
A few things to check from the basic to the more obscure.
1) Can you ftp within the server both to localhost and the server name?
ftp localhost
ftp localservername
2) Is the server name and IP address consistent?
Check on every machine:
nslookup servername1
nslookup servername2
3) Are there rogue .netrc files ?
Search each source computer for .netrc files and inspect permissions and contents.
4) FTP can be crippled by certain physical network configuration issues
No network port on the server, switch or hub should be set to auto-detect or auto-negotiate. The mess this can create is very difficult to detect but a common symptom is connections dropping to half-duplex and CRC errors.
A cold start of network components and then servers will often cure these symptoms for a while. A random order cold start (e.g. after a power failure) will often cause these symptoms. Re-patching a network connection is another way of causing these symptoms.
5) FTP does not like the "jumbo packets" setting in any network components and will often hang.
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NETRC(5) BSD File Formats Manual NETRC(5)
NAME
netrc -- user configuration for ftp
SYNOPSIS
~/.netrc
DESCRIPTION
This file contains configuration and autologin information for the File Transfer Protocol client ftp(1).
The .netrc file contains login and initialization information used by the auto-login process. It resides in the user's home directory. The
following tokens are recognized; they may be separated by spaces, tabs, or new-lines:
machine name
Identify a remote machine name. The auto-login process searches the .netrc file for a machine token that matches the remote
machine specified on the ftp command line or as an open command argument. Once a match is made, the subsequent .netrc tokens are
processed, stopping when the end of file is reached or another machine or a default token is encountered.
default This is the same as machine name except that default matches any name. There can be only one default token, and it must be after
all machine tokens. This is normally used as:
default login anonymous password user@site
thereby giving the user automatic anonymous ftp login to machines not specified in .netrc. This can be overridden by using the -n
flag to disable auto-login.
login name
Identify a user on the remote machine. If this token is present, the auto-login process will initiate a login using the specified
name.
password string
Supply a password. If this token is present, the auto-login process will supply the specified string if the remote server requires
a password as part of the login process. Note that if this token is present in the .netrc file for any user other than anonymous,
ftp will abort the auto-login process if the .netrc is readable by anyone besides the user.
account string
Supply an additional account password. If this token is present, the auto-login process will supply the specified string if the
remote server requires an additional account password, or the auto-login process will initiate an ACCT command if it does not.
macdef name
Define a macro. This token functions like the ftp macdef command functions. A macro is defined with the specified name; its con-
tents begin with the next .netrc line and continue until a null line (consecutive new-line characters) is encountered. If a macro
named init is defined, it is automatically executed as the last step in the auto-login process.
SEE ALSO
ftp(1), ftpd(8)
Linux NetKit (0.17) September 23, 1997 Linux NetKit (0.17)