ftp_nlist "425 Can't open data connectoin"

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  • blackpuppy
    #1

    ftp_nlist "425 Can't open data connectoin"

    I am just beginner on PHP. I am reading "Spring Into PHP 5" but cannot
    make the ftp examples work.

    I am running PHP scripts on a Fedora Core 5 (VMWare virtual machine) on
    top of a Windows XP Professional. The PHP version is 5.1.4. The PHP
    script is shown below.

    #! /usr/bin/php
    <?php
    $ftp_server = "myftpserve r";
    $connect = ftp_connect($ft p_server)
    or die("Couldn't connect to $ftp_server.");
    $result = ftp_login($conn ect, "myftpuser" , "mypassword ")
    or die("Couldn't log in $ftp_server.");
    $a = ftp_nlist($conn ect, "/");
    foreach($a as $value){
    echo $value, "\n";
    }
    ?>

    I run the above script in a GENOME terminal. It seems it can connect
    and log in to the ftp server successfully. But then the ftp_nlist()
    call fails. And the server has the following log for this call.
    NLST /
    150 Opening data channel for directory list.
    425 Can't open data connection.
    I do not know what is wrong. But in a terminal I can manually log in
    the ftp server, and the ls or nlist command will give the file list as
    expected. So I suspect the problem is at the PHP ftp function.

    The PHP manual on FTP functions
    (http://www.php.net/manual/en/ref.ftp.php) has the following
    explanation.

    "No external libraries are needed to build this extension.

    In order to use FTP functions with your PHP configuration, you should
    add the --enable-ftp option when installing PHP 4 or greater or
    --with-ftp when using PHP 3.

    This extension has no configuration directives defined in php.ini."

    My questions are:
    - How could I know what is wrong with the ftp_nlist() call?
    - How could I know if the FTP functions are enabled at PHP
    installation?
    - How to make the FTP functions work?

    Thanks a lot!

    Tags: None
    • Patrick Schlangen
      #2
      Re: ftp_nlist &quot;425 Can't open data connectoin&quot ;

      Hi,
      - How could I know if the FTP functions are enabled at PHP
      installation?
      they are. Otherwise you would get a error about a undefined function.
      - How to make the FTP functions work?
      You might need to use PASSIVE ftp mode (e.g. because of firewall or NAT
      settings).
      Just try this:

      #! /usr/bin/php
      <?php
      $ftp_server = "myftpserve r";
      $connect = ftp_connect($ft p_server)
      or die("Couldn't connect to $ftp_server.");
      $result = ftp_login($conn ect, "myftpuser" , "mypassword ")
      or die("Couldn't log in $ftp_server.");
      ftp_pasv($conne ct, true);
      $a = ftp_nlist($conn ect, "/");
      foreach($a as $value){
      echo $value, "\n";
      }
      ?>

      I just added one line (""ftp_pasv($co nnect, true);"").
      Please let us know if it works now.

      Patrick


        Comment

        • blackpuppy
          #3
          Re: ftp_nlist &quot;425 Can't open data connectoin&quot ;

          Thanks, Patrick!

          It works! ftp_pasv($conne ct, true) will turns on passive mode so that
          the ftp client will initiate the data connection and this will work
          around the firewall. Then I enable FTP in the firewall and the script
          can work without turning on the passive mode.

          There is a further problem when I put the above script in a web page as
          shown below.

          <HTML>

          <HEAD>

          <TITLE>

          Getting a directory listing with FTP

          </TITLE>

          </HEAD>



          <BODY>

          <CENTER>

          <H1>Getting a directory listing with FTP</H1>

          Here's what's in the remote directory:

          <BR>

          <BR>

          <?php
          $ftp_server = "myftpserve r";
          $connect = ftp_connect($ft p_server)
          or die("Couldn't connect to $ftp_server.");
          $result = ftp_login($conn ect, "myftpuser" , "mypassword ")
          or die("Couldn't log in $ftp_server.");
          $a = ftp_nlist($conn ect, "/");
          foreach($a as $value){
          echo $value, "\n";
          }
          ?>
          </CENTER>

          <BODY>

          </HTML>

          Then I access it from Firefox with URL
          http://localhost/SpringIntoPHP5/ch09/phpftp.php. The display is:
          ---------------------------------------------------------
          Here's what's in the remote directory:

          Couldn't connect to myftpserver.
          ---------------------------------------------------------

          So it fails at ftp_connect($ft p_server) call. Does the PHP FTP
          function work differently when running from a web page? Is there
          anything related with Firefox? BTW, other examples from this book work
          just fine when viewing from Firefox. Or is it because the script is
          running under the account apache and this account does not have enough
          privilege?

          Thanks again!

          Patrick Schlangen wrote:
          - How to make the FTP functions work?
          >
          You might need to use PASSIVE ftp mode (e.g. because of firewall or NAT
          settings).
          Just try this:
          >
          #! /usr/bin/php
          <?php
          $result = ftp_login($conn ect, "myftpuser" , "mypassword ")
          or die("Couldn't log in $ftp_server.");
          ftp_pasv($conne ct, true);
          $a = ftp_nlist($conn ect, "/");
          ?>
          >
          I just added one line (""ftp_pasv($co nnect, true);"").
          Please let us know if it works now.
          >
          Patrick

            Comment

            • blackpuppy
              #4
              Re: ftp_nlist &quot;425 Can't open data connectoin&quot ;

              At last it's solved. It's because of SELinux settings.

              I am using GNOME. Go to System --Administration --Security Level
              and Filewall. Click SELinux tab. Expand "HTTPD Service", and check
              "Allow HTTPD scripts and modules to connect to the network". Then
              expand "Other", and check "httpd_enable_f tp_server". Finally click OK
              button to close the "Security Level Configuration" dialog.

              After the above changes, the php web page will work.

              Thanks!

              blackpuppy wrote:
              Thanks, Patrick!
              >
              It works! ftp_pasv($conne ct, true) will turns on passive mode so that
              the ftp client will initiate the data connection and this will work
              around the firewall. Then I enable FTP in the firewall and the script
              can work without turning on the passive mode.
              >
              There is a further problem when I put the above script in a web page as
              shown below.
              >
              <HTML>
              >
              <HEAD>
              >
              <TITLE>
              >
              Getting a directory listing with FTP
              >
              </TITLE>
              >
              </HEAD>
              >
              >
              >
              <BODY>
              >
              <CENTER>
              >
              <H1>Getting a directory listing with FTP</H1>
              >
              Here's what's in the remote directory:
              >
              <BR>
              >
              <BR>
              >
              <?php
              $ftp_server = "myftpserve r";
              $connect = ftp_connect($ft p_server)
              or die("Couldn't connect to $ftp_server.");
              $result = ftp_login($conn ect, "myftpuser" , "mypassword ")
              or die("Couldn't log in $ftp_server.");
              $a = ftp_nlist($conn ect, "/");
              foreach($a as $value){
              echo $value, "\n";
              }
              ?>
              </CENTER>
              >
              <BODY>
              >
              </HTML>
              >
              Then I access it from Firefox with URL
              http://localhost/SpringIntoPHP5/ch09/phpftp.php. The display is:
              ---------------------------------------------------------
              Here's what's in the remote directory:
              >
              Couldn't connect to myftpserver.
              ---------------------------------------------------------
              >
              So it fails at ftp_connect($ft p_server) call. Does the PHP FTP
              function work differently when running from a web page? Is there
              anything related with Firefox? BTW, other examples from this book work
              just fine when viewing from Firefox. Or is it because the script is
              running under the account apache and this account does not have enough
              privilege?
              >
              Thanks again!
              >

                Comment

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