Opened 18 years ago
Last modified 9 years ago
#971 closed Bug report
Filezilla Hangs in SFTP+ClientAliveInterval
|Reported by:||seelie||Owned by:||Alexander Schuch|
|Keywords:||Cc:||seelie, Alexander Schuch|
|Component version:||Operating system type:|
|Operating system version:|
SFTP using SSH2 works fine with the default
(server-side) sshd_config setting, "ClientAliveInterval 0"
However, Filezilla is stuck in this infinite loop:
causing 100% CPU load, if you set:
"ClientAliveInterval 15 (or any non-zero value)"
--i.e. if sshd sends a message through the encrypted
channel to request a response from the client--,
(ClientAliveInterval * ClientAliveCountMax)
seconds have passed.
Always reproducible on FileZilla 2.2.17
on my Windows 2000 Pro SP4.
This problem happens both for "KeepAlive yes/no" in
but in my test, Filezilla does:
many times when KeepAlive no, while doing it only once
when KeepAlive yes. (This pert may be unrelated to the
debug.log ("Trace messages from the FTP engine") attached.
This log was taken when sshd_config was:
And the problem seems to have happened 45 seconds
after the session becomes idle.
Quote from man sshd_config
If ClientAliveInterval (above) is set to 15, and
ClientAliveCountMax is left at the default,
unresponsive ssh clients
will be disconnected after approximately 45 seconds.
Change History (7)
by , 18 years ago
comment:1 by , 16 years ago
Can you please try the most recent version of FileZilla 2 or preferable even FileZilla 3 beta?
SFTP is handled by the PuTTY suite and lots of changed had been done there already which were merged into the FileZilla source. Chances are that this issue has been fixed already.
comment:2 by , 16 years ago
Related but already closed (as duplicate) bug:
[ 1455727 ] Remote file list hangs after a while
comment:3 by , 16 years ago
Maybe the following bug is related to this one as well:
[ 1447224 ] Loops at 100% CPU after SFTP upload
comment:4 by , 16 years ago
Maybe related to the following one as well:
[ 1442770 ] Processor usage when connection times out
comment:5 by , 16 years ago
Related (but closed as duplicate) bug:
[ 1183119 ] 2.2.29 fzsftp tacks CPU to 100%
comment:6 by , 16 years ago
This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).
Trace messages from the FTP engine