FTPClient listFiles command failing

[Kris Nuttycombe]

Hello, all - any help is appreciated.

I'm having difficulty using the commons.net.ftp.FTPClient when 
attempting to get a file list. The client connects correctly and I can 
issue CWD commands without difficulty, but as soon as I issue 
listFiles() or nlst() it fails with the reply string "Unable to build 
data connection: Connection timed out"

Does anyone have an idea of where I should start looking to fix this?

Thanks,

Kris Nuttycombe

Here is some debugging output:

0 [main] DEBUG gov.noaa.nosa.argo.ArgoReader  - 220 zeus.aoml.noaa.gov 
FTP server ready
116 [main] DEBUG gov.noaa.nosa.argo.ArgoReader  - 230 Anonymous access 
granted, restrictions apply.
167 [main] DEBUG gov.noaa.nosa.argo.ArgoReader  - 250 CWD command 
successful.
170 [main] DEBUG gov.noaa.nosa.argo.ArgoReader  - FTP connection 
successfully established to ftp.aoml.noaa.gov/phod/pub/ARGO_FTP/argo/nc/aoml
170 [main] DEBUG gov.noaa.nosa.argo.ArgoReader  - FTP Data connection 
mode: 0
java.io.IOException: FTP client could not obtain file list : 425 Unable 
to build data connection: Connection timed out

Here is the code that generated it:

               client.connect(host);
               log.debug(client.getReplyString());
               if(!FTPReply.isPositiveCompletion(client.getReplyCode())) {
                   throw new IOException("FTP server at host " + host + 
" refused connection.");
               }
              
               client.login(user, password);
               log.debug(client.getReplyString());
               if(!FTPReply.isPositiveCompletion(client.getReplyCode())) {
                   throw new IOException("FTP login failed for user 
anonymous: " + client.getReplyString());
               }
              
               client.changeWorkingDirectory(path);
               log.debug(client.getReplyString());
               if(!FTPReply.isPositiveCompletion(client.getReplyCode())) {
                   throw new IOException("FTP client could not change 
to remote directory " + path + ": " + client.getReplyString());
               }
              
               log.debug("FTP connection successfully established to " 
+ host + path);
               log.debug("FTP Data connection mode: " + 
client.getDataConnectionMode());
              
               FTPFile[] files = client.listFiles(path);
               if(!FTPReply.isPositiveCompletion(client.getReplyCode())) {
                    throw new IOException("FTP client could not obtain 
file list : " + client.getReplyString());
               }



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