FTP not working under Linux but working under any other OS ??? Very strange

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Operating Systems Linux FTP not working under Linux but working under any other OS ??? Very strange
# 1  
Old 04-21-2010
Network FTP not working under Linux but working under any other OS ??? Very strange

Dear all,

I am totally despaired and puzzled.

Using Filezilla under Windows under the same network as our Linux servers is working. Using FTP command-line client under any of our Linux debian servers is not working ! I tried with different FTP servers -> same problem !

All commands are working (login, cd, and so on) but as soon as a copy starts, the file is created on server with 0 size and sometimes some 2'880 bytes are copied but almost all time it's stuck !

And the worst is that it's difficult to give you technical details, I'm just doing
ftp ftp.domain.com
user / pass
cd directory
put localfile destfile (here it is blocking for hours / or timeout)
Any help would be greatly appreciated !

# 2  
Old 04-21-2010
Try ftp -p ftp.domain.com so it does transfers in passive mode, which tolerates firewalls more easily.
# 3  
Old 04-21-2010
Thanks a lot for your suggestion but in this case passive mode doesn't work at all (not in Filezilla either)... I can only work with active mode...

Something very strange : last week it was working perfectly and suddently it does not work anymore ?
# 4  
Old 04-21-2010
Something strange indeed is going on if not even passive mode is working. What FTP server is this?
# 5  
Old 04-22-2010
I tried on two servers, same problem...
Both are vsftpd as far as I know...

# 6  
Old 04-22-2010
Can you show us a copy of /etc/vsftpd/vsftpd.conf?
# 7  
Old 04-22-2010
Assuming you don't find a firewall blocking the ftp data channel, it is likely to be a network negotiation issue.

Try setting this parameter as low as 1024 bytes rather than allowing negotiation. If it works, then try increasing the figure in multiples of 1024.

Consider asking your network administrator to check that every network connection involved is not set to auto-negotiate and that all are set to Full Duplex. That includes switches and hubs connecting to each other. Commonly they will drop to Half-Duplex if not set correctly or have been re-patched with the power on.
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