Keep alive

Hi, using the SmartFTP library we're getting a lot of customers having timeout problems when uploading large files, e.g.:

[20061107 11:26:56] SmartFTP FTP Library v1.5.8.35
[20061107 11:26:56] Resolving host name "music.sobel.info"
[20061107 11:26:57] Connecting to xxx.xxx.xxx.xxx Port: 21
[20061107 11:26:57] Connected to xxx.xxx.xxx.
[20061107 11:26:57] 220 ProFTPD 1.3.0rc2 Server (DreamHost FTP) [xxx.xxx.xxx.xxx]
[20061107 11:26:57] USER xxx
[20061107 11:26:57] 331 Password required for xxx.
[20061107 11:26:57] PASS (hidden)
[20061107 11:26:57] 230 User xxx logged in.
[20061107 11:26:57] SYST
[20061107 11:26:57] 215 UNIX Type: L8
[20061107 11:26:57] Detected Server Type: UNIX
[20061107 11:26:57] FEAT
[20061107 11:26:57] 211-Features:
[20061107 11:26:57] MDTM
[20061107 11:26:57] REST STREAM
[20061107 11:26:57] SIZE
[20061107 11:26:57] 211 End
[20061107 11:26:57] PWD
[20061107 11:26:57] 257 "/" is current directory.
[20061107 11:26:57] SITE ZONE
[20061107 11:26:57] 500 'SITE ZONE' not understood
...
[20061107 11:38:09] PASV
[20061107 11:38:09] 227 Entering Passive Mode (208,97,172,53,203,84).
[20061107 11:38:09] Opening data connection to 208.97.172.53 Port: 52052
[20061107 11:38:09] STOR SBSE____.TMP
[20061107 11:38:10] 150 Opening BINARY mode data connection for SBSE____.TMP
[20061107 12:18:20] 84354464 bytes transferred. (34.1 KB/s) (00:40:10)

And then nothing until the timeout. Using other FTP clients on the same computer to the same server with the same files they're not having any problems. Any ideas about what could be causing this?

It's very unlikely caused by the client (SmartFTP FTP Library in this case).

Regards,
SmartFTP


It's very unlikely caused by the client (SmartFTP FTP Library in this case).
But we're getting increasing numbers of complaints from various people using various FTP servers, and in all cases they can use another FTP client with the same file on the same server and have no timeout problem. So far it only appears to be a problem with uploading and not downloading. Was there any recent change related to uploading?

Hello ..

As the problem is unknown to us, please provide step by step instructions on how we can reproduce it. Thank you.

Regards,
SmartFTP