can't open data connection 1% of the time

Message

wwu2 · #1 Post by **wwu2** » 2006-06-09 18:11

Hi

I am using FZS 0.9.12 beta with active mode on windows server 2003. I receive a few thousands files per day. But once in a while (approx 1% of the time) I get a "can't open data connection on the log file and the upload fails. I have set the server to run with 16 threads and set no timeouts.

(085463) 21:05:43 PM - --- (111,111,1,111)> 230 Logged on
(085463) 21:05:44 PM - --- (111,111,1,111)> TYPE I
(085463) 21:05:44 PM - --- (111,111,1,111)> 200 Type set to I
(085463) 21:05:44 PM - --- (111,111,1,111)> SITE umask 777
(085463) 21:05:44 PM - --- (111,111,1,111)> 504 Command not implemented for that parameter
(085463) 21:05:44 PM - --- (111,111,1,111)> CWD /A/
(085463) 21:05:44 PM - --- (111,111,1,111)> 250 CWD successful. "/A" is current directory.
(085463) 21:05:44 PM - --- (111,111,1,111)> ALLO 62230
(085463) 21:05:44 PM - --- (111,111,1,111)> 202 No storage allocation neccessary.
(085463) 21:05:44 PM - --- (111,111,1,111)> PORT 111,111,1,111,229,23
(085463) 21:05:44 PM - --- (111,111,1,111)> 200 Port command successful
(085463) 21:05:44 PM - --- (111,111,1,111)> STOR a.gz
(085463) 21:05:44 PM - --- (111,111,1,111)> 150 Opening data channel for file transfer.
(085463) 21:05:54 PM - --- (111,111,1,111)> 425 Can't open data connection.
(085463) 21:06:44 PM - --- (111,111,1,111)> QUIT
(085463) 21:06:44 PM - --- (111,111,1,111)> 221 Goodbye
(085463) 21:06:44 PM - --- (111,111,1,111)> disconnected.

any idea anyone?

thanks

Martin

#2 Post by **botg** » 2006-06-09 21:13

The PORT command is issued by the clients. It's possible that the client's firewall or router blocks that port.

wwu2 · #3 Post by **wwu2** » 2006-06-10 18:21

I know that it is not ports that are blocked since it does work most of the time.

To be certain I did check the logs for a port number that resulted in a "can't open data connection" and I did received some files from that port.

So it is really a "sometime doesn't work" type of problem

Could it be that FZS is too busy or is missing resources???

Thanks for your help

Martin

#4 Post by **botg** » 2006-06-13 07:26

There could be a lot of reasons. It might just be some sort of congestion problem.