Ftp error 451

Problem

The FTP client issues message EZA2537E or the FTP server issues a 451 error message indicating that a file transfer failed because a record was longer than the specified LRECL.

Symptom

You will see the following message from the FTP client:

     EZA2537E File transfer failed. File contains records that
     are longer than the LRECL of the new file.

The following message will be output to the FTP client from the FTP server:

     451-File transfer failed. File contains records that are
     longer than the LRECL of the new file.

Cause

In the FTP.DATA configuration data set, the TRUNCATE parameter has a default value of TRUE. This means that if the WRAPRECORD parameter is set to FALSE and an input record is longer than the LRECL of a new file, the record will be truncated to the size of the LRECL.

With the Communications Server for z/OS product are shipped the following sample FTP.DATA data sets:

• SEZAINST(FTCDATA)
• SEZAINST(FTPSDATA).

Most parameters in these samples have the default value set. However, for the TRUNCATE parameter, the value is set to FALSE. This means that if a record needs to be truncated, an error will be set and the FTP job will fail. This is done to insure that the data transfer is not reported as a success when some of the data has not been transferred.

Resolving The Problem

If you do not wish to have an error issued and your FTP job failed because a record is longer than the LRECL, be sure to use the default value of TRUE for TRUNCATE.

You can accomplish this by specifying the following command sequence:

quote site truncate ; indicates data is to be truncated

put source-file target-file

quote site notruncate ; turns off data truncation

Alternatively, by setting the WRAPRECORD parameter to TRUE, you can avoid the loss of data. This will result in any data received in addition to the LRECL being added to the next record if no new-line character is received.

Всем нам известно что такое FTP (англ. File Transfer Protocol — протокол передачи файлов). Иногда в процессе эксплуатации или настройки нужного нам сервиса возникают ошибки которые описаны кодами ошибок FTP.

При FTP операциях некоторые клиенты не только пишут коды сообщений, но и расшифровавают их. Но не всегда. Например, при установке соединения, мы получили от FTP клиента код ошибки 434, и что это значит?

Попробуем разобраться разбив код ошибки на цифры (каждая позиция отвечает за свой набор значений):

Первая позиция

• 1 это — команда принята к выполнению но все еще не завершена
• 2 это — команда завершена успешно
• 3 это — команда принята, но ожидается дополнительная команда
• 4 это — в данный момент команда не может быть выполнена
• 5 это — невозможно выполнить команду в принципе

Вторая позиция

• 0 это — синтаксическая ошибка в команде
• 1 это — информационное сообщение
• 2 это — означает что сообщение относится к управляющему соединению либо соединению данных
• 3 это — сообщение о аутентификации пользователя и его правах
• 4 — не определено
• 5 — состояние файловой системы

Третья позиция

• Третья цифра окончательно специфицирует ошибку.

Вот и все, надеюсь этот материал поможет Вам лучше понимать FTP :))

curl -vvv --cacert /etc/ssl/ftp_web01.crt --ssl-reqd -T ~/tmp/snap.jpg -u "${USERNAME}:${PASSWORD}" ${FTP}/snap.jpg

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying 193.183.99.125:21...
* Connected to web01.example.com (192.168.1.100) port 21 (#0)
< 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
< 220-You are user number 1 of 50 allowed.
< 220-Local time is now 08:45. Server port: 21.
< 220-This is a private system - No anonymous login
< 220-IPv6 connections are also welcome on this server.
< 220 You will be disconnected after 15 minutes of inactivity.
> AUTH SSL
< 500 This security scheme is not implemented
> AUTH TLS
< 234 AUTH TLS OK.
* successfully set certificate verify locations:
*  CAfile: /etc/ssl/ftp_web01.crt
*  CApath: /etc/ssl/certs
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [88 bytes data]
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [155 bytes data]
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
{ [6 bytes data]
* TLSv1.3 (IN), TLS handshake, Certificate (11):
{ [1077 bytes data]
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
{ [264 bytes data]
* TLSv1.3 (IN), TLS handshake, Finished (20):
{ [52 bytes data]
* TLSv1.3 (OUT), TLS handshake, Finished (20):
} [52 bytes data]
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* Server certificate:
*  SSL certificate verify ok.
} [5 bytes data]
> USER username_camera
{ [5 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [233 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [233 bytes data]
* old SSL session ID is stale, removing
{ [5 bytes data]
< 331 User username_camera OK. Password required
} [5 bytes data]
> PASS v3rys3cr3t
{ [5 bytes data]
< 230 OK. Current restricted directory is /
} [5 bytes data]
> PBSZ 0
{ [5 bytes data]
< 200 PBSZ=0
} [5 bytes data]
> PROT P
{ [5 bytes data]
< 200 Data protection level set to "private"
} [5 bytes data]
> PWD
{ [5 bytes data]
< 257 "/" is your current location
* Entry path is '/'
* Request has same path as previous transfer
} [5 bytes data]
> EPSV
* Connect data stream passively
* ftp_perform ends with SECONDARY: 0
{ [5 bytes data]
< 500 Unknown command
* Failed EPSV attempt. Disabling EPSV
} [5 bytes data]
> PASV
{ [5 bytes data]
< 227 Entering Passive Mode (192,168,1,100,155,205)
* Skip 192.168.1.100 for data connection, re-use web01.example.com instead
*   Trying 192.168.1.100:39885...
* Connecting to 192.168.1.100 (192.168.1.100) port 39885
* Connected to web01.example.com (192.168.1.100) port 21 (#0)
} [5 bytes data]
> TYPE I
{ [5 bytes data]
< 200 TYPE is now 8-bit binary
} [5 bytes data]
> STOR snap.jpg
{ [5 bytes data]
< 150 Accepted data connection
* Doing the SSL/TLS handshake on the data stream
* successfully set certificate verify locations:
*  CAfile: /etc/ssl/ftp_web01.crt
*  CApath: /etc/ssl/certs
* SSL re-using session ID
} [5 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [574 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [88 bytes data]
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
} [1 bytes data]
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
} [607 bytes data]
* TLSv1.3 (IN), TLS handshake, Server hello (2):
{ [161 bytes data]
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
{ [6 bytes data]
* TLSv1.3 (IN), TLS handshake, Finished (20):
{ [52 bytes data]
* TLSv1.3 (OUT), TLS handshake, Finished (20):
} [52 bytes data]
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* Server certificate:
*  SSL certificate verify ok.
} [5 bytes data]
* We are completely uploaded and fine
* Remembering we are in dir ""
} [5 bytes data]
* TLSv1.3 (OUT), TLS alert, close notify (256):
} [2 bytes data]
< 451-Error during read from data connection
{ [5 bytes data]
< 451-Transfer aborted
{ [5 bytes data]
< 451 0.234 seconds (measured here), 1.74 Mbytes per second
* server did not report OK, got 451
100  780k    0     0  100  780k      0  1040k --:--:-- --:--:-- --:--:-- 1041k
* Connection #0 to host web01.example.com left intact
curl: (18) server did not report OK, got 451

curl 7.74.0 (x86_64-pc-linux-gnu) libcurl/7.74.0 OpenSSL/1.1.1k zlib/1.2.11 brotli/1.0.9 libidn2/2.3.0 libpsl/0.21.0 (+libidn2/2.3.0) libssh2/1.9.0 nghttp2/1.43.0 librtmp/2.3
Release-Date: 2020-12-09
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp 
Features: alt-svc AsynchDNS brotli GSS-API HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM NTLM_WB PSL SPNEGO SSL TLS-SRP UnixSockets

Debian 11.2
Linux arca 5.10.0-9-amd64 #1 SMP Debian 5.10.70-1 (2021-09-30) x86_64 GNU/Linux

Xencored

503 Bad sequence of commands

Posts: 18

Joined: 2012-04-08 16:17

First name: Michael

Last name: Johnson

Command:	STOR downtherabbithole.co.uk.tar.gz
Response:	451 downtherabbithole.co.uk.tar.gz: Append/Restart not permitted, try again
Error:	File transfer failed after transferring 262,144 bytes in 1 second
Status:	Starting upload of D:Backups19227-05-13downtherabbithole.co.uk.tar.gz
Status:	Retrieving directory listing...

botg

Site Admin

Posts: 34744

Joined: 2004-02-23 20:49

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Last name: Kosse

Contact:

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503 Bad sequence of commands

Posts: 18

Joined: 2012-04-08 16:17

First name: Michael

Last name: Johnson

Response:	451 downtherabbithole.co.uk.tar.gz: Append/Restart not permitted, try again
Error:	File transfer failed

boco

Contributor

Posts: 26451

Joined: 2006-05-01 03:28

Location: Germany

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503 Bad sequence of commands

Posts: 18

Joined: 2012-04-08 16:17

First name: Michael

Last name: Johnson

#
# /etc/proftpd/proftpd.conf -- This is a basic ProFTPD configuration file.
# To really apply changes, reload proftpd after modifications, if
# it runs in daemon mode. It is not required in inetd/xinetd mode.
# 

# Includes DSO modules
Include /etc/proftpd/modules.conf

# Set off to disable IPv6 support which is annoying on IPv4 only boxes.
UseIPv6				on
# If set on you can experience a longer connection delay in many cases.
IdentLookups			off

ServerName			"Debian"
ServerType			standalone
DeferWelcome			off

MultilineRFC2228		on
DefaultServer			on
ShowSymlinks			on

TimeoutNoTransfer		600
TimeoutStalled			600
TimeoutIdle			1200

DisplayLogin                    welcome.msg
DisplayChdir               	.message true
ListOptions                	"-l"

DenyFilter			*.*/

# Use this to jail all users in their homes 
# DefaultRoot			~

# Users require a valid shell listed in /etc/shells to login.
# Use this directive to release that constrain.
# RequireValidShell		off

# Port 21 is the standard FTP port.
Port				21

# In some cases you have to specify passive ports range to by-pass
# firewall limitations. Ephemeral ports can be used for that, but
# feel free to use a more narrow range.
# PassivePorts                  49152 65534

# If your host was NATted, this option is useful in order to
# allow passive tranfers to work. You have to use your public
# address and opening the passive ports used on your firewall as well.
# MasqueradeAddress		1.2.3.4

# This is useful for masquerading address with dynamic IPs:
# refresh any configured MasqueradeAddress directives every 8 hours
<IfModule mod_dynmasq.c>
# DynMasqRefresh 28800
</IfModule>

# To prevent DoS attacks, set the maximum number of child processes
# to 30.  If you need to allow more than 30 concurrent connections
# at once, simply increase this value.  Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances			30

# Set the user and group that the server normally runs at.
User				proftpd
Group				nogroup

# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
Umask				022  022
# Normally, we want files to be overwriteable.
AllowOverwrite			on

# Uncomment this if you are using NIS or LDAP via NSS to retrieve passwords:
# PersistentPasswd		off

# This is required to use both PAM-based authentication and local passwords
# AuthOrder			mod_auth_pam.c* mod_auth_unix.c

# Be warned: use of this directive impacts CPU average load!
# Uncomment this if you like to see progress and transfer rate with ftpwho
# in downloads. That is not needed for uploads rates.
#
# UseSendFile			off

TransferLog /var/log/proftpd/xferlog
SystemLog   /var/log/proftpd/proftpd.log

# Logging onto /var/log/lastlog is enabled but set to off by default
#UseLastlog on

# In order to keep log file dates consistent after chroot, use timezone info
# from /etc/localtime.  If this is not set, and proftpd is configured to
# chroot (e.g. DefaultRoot or <Anonymous>), it will use the non-daylight
# savings timezone regardless of whether DST is in effect.
#SetEnv TZ :/etc/localtime

<IfModule mod_quotatab.c>
QuotaEngine off
</IfModule>

<IfModule mod_ratio.c>
Ratios off
</IfModule>


# Delay engine reduces impact of the so-called Timing Attack described in
# http://www.securityfocus.com/bid/11430/discuss
# It is on by default. 
<IfModule mod_delay.c>
DelayEngine on
</IfModule>

<IfModule mod_ctrls.c>
ControlsEngine        off
ControlsMaxClients    2
ControlsLog           /var/log/proftpd/controls.log
ControlsInterval      5
ControlsSocket        /var/run/proftpd/proftpd.sock
</IfModule>

<IfModule mod_ctrls_admin.c>
AdminControlsEngine off
</IfModule>

#
# Alternative authentication frameworks
#
#Include /etc/proftpd/ldap.conf
#Include /etc/proftpd/sql.conf

#
# This is used for FTPS connections
#
#Include /etc/proftpd/tls.conf

#
# Useful to keep VirtualHost/VirtualRoot directives separated
#
#Include /etc/proftpd/virtuals.con

# A basic anonymous configuration, no upload directories.

# <Anonymous ~ftp>
#   User				ftp
#   Group				nogroup
#   # We want clients to be able to login with "anonymous" as well as "ftp"
#   UserAlias			anonymous ftp
#   # Cosmetic changes, all files belongs to ftp user
#   DirFakeUser	on ftp
#   DirFakeGroup on ftp
# 
#   RequireValidShell		off
# 
#   # Limit the maximum number of anonymous logins
#   MaxClients			10
# 
#   # We want 'welcome.msg' displayed at login, and '.message' displayed
#   # in each newly chdired directory.
#   DisplayLogin			welcome.msg
#   DisplayChdir		.message
# 
#   # Limit WRITE everywhere in the anonymous chroot
#   <Directory *>
#     <Limit WRITE>
#       DenyAll
#     </Limit>
#   </Directory>
# 
#   # Uncomment this if you're brave.
#   # <Directory incoming>
#   #   # Umask 022 is a good standard umask to prevent new files and dirs
#   #   # (second parm) from being group and world writable.
#   #   Umask				022  022
#   #            <Limit READ WRITE>
#   #            DenyAll
#   #            </Limit>
#   #            <Limit STOR>
#   #            AllowAll
#   #            </Limit>
#   # </Directory>
# 
# </Anonymous>

# Include other custom configuration files
Include /etc/proftpd/conf.d/

boco

Contributor

Posts: 26451

Joined: 2006-05-01 03:28

Location: Germany

Xencored

503 Bad sequence of commands

Posts: 18

Joined: 2012-04-08 16:17

First name: Michael

Last name: Johnson

Status:	Connected
Status:	Starting upload of H:Server29-05-13downtherabbithole.co.uk.tar.gz
Command:	CWD /home/xencored/restore
Response:	250 CWD command successful
Status:	Retrieving directory listing...
Command:	TYPE I
Response:	200 Type set to I
Command:	PASV
Response:	227 Entering Passive Mode (5,39,78,152,158,246).
Command:	MLSD
Response:	150 Opening ASCII mode data connection for MLSD
Response:	226 Transfer complete
Command:	PASV
Response:	227 Entering Passive Mode (5,39,78,152,229,124).
Command:	REST 2446606919
Response:	350 Restarting at 2446606919. Send STORE or RETRIEVE to initiate transfer
Command:	STOR downtherabbithole.co.uk.tar.gz
Response:	150 Opening BINARY mode data connection for downtherabbithole.co.uk.tar.gz
Response:	226 Transfer complete
Status:	File transfer successful, transferred 62 bytes in 1 second
Status:	Retrieving directory listing...
Command:	CWD /home/xencored
Response:	250 CWD command successful
Command:	PWD
Response:	257 "/home/xencored" is the current directory
Command:	PASV
Response:	227 Entering Passive Mode (5,39,78,152,146,94).
Command:	REST 0
Response:	350 Restarting at 0. Send STORE or RETRIEVE to initiate transfer
Command:	MLSD
Response:	150 Opening ASCII mode data connection for MLSD
Response:	226 Transfer complete
Status:	Directory listing successful
Status:	Disconnected from server