Bad upload resume

[Jan Lachnitt]

I use a wireless connection which loses some packets so TCP connections are lost quite often. I've installed FileZilla especially for uploading large files because I've heard it resumes uploads correctly. But sometimes it obviously doesn't.

I uploaded a 31MB zip file and found out that the file on the server is a bit larger than the original file. I've retried several times and the resulting file size is each time different but always a bit greater than the correct one. The original file size is 32735774 B and the resulting file size is e.g. (in the logged case) 32763514 B.

I uploaded also a 13MB file and this was uploaded incorrectly for the first time and correctly for the second time so FZ resumes uploads incorrectly only sometimes.

Version: 3.1.3 (2008-09-21)

[Jan Lachnitt]

That 13MB file is also damaged, though it has the correct size :-(

[Jan Lachnitt]

Maybe I should mention I use Comodo firewall but this doesn't seem to break anything.

[Tim Kosse]

What happens if you uninstall the firewall?

[Jan Lachnitt]

If I uninstall the firewall, the first what will happen is that Vista will activate its own firewall. I can disable this firewall because

• I know how to do it,
• my ISP seems to block all incoming connections so it should be safe to do it.

Should I disable Windows firewall or let it work?

[murrayd]

I'm experiencing the same problem Uploading large files, losing link and auto-resuming multiple times causes data corruption. EXTREMELY annoying and unacceptable.

I have a simple old firewall (Sygate Personal), I doubt the firewall has anything to do with this problem that I doubt. Only occurs with FileZilla. (I've also prepared a debug log in case it's needed)

[Tim Kosse]

Unreproducible problem only 2 people have. Hardly critical.

[Tim Kosse]

To ensure file integrity even on highly unreliable connections such as yours, you want to use FTP over TLS or SFTP instead.

The FTP protocol does not provide any other means to ensure integrity of the transferred data.