Can't upload some AVI files to FZ-Server!?!

[mightyknife]

I've a strange behaviour with Filezilla 2.2.17 and
Filezilla-Server 0.9.11 - perhaps someone of you can
check if this is really a bug - or if simply my router
(Linksys WRT54GS, but doesn't matter) may be the reason
for this.

I set up a Filezilla-Server on my computer
(192.168.0.2) behind my extrenal router (192.168.0.1).
The router is configured to let traffic on port 20/21
through to my server. The Filezilla-Server is
configured to accept connections on port 21 as usual.
In the "Passive mode settings" i wrote my external IP
address in the "Use the following IP" field and
configured the "Custom port range" to 20-20.

Now i took a Filezilla-Client on one of my other
computers (192.168.0.130), configured a connection to
my server using the PASSIVE mode and connected to the
server. I uploaded some files - no problem, the upload
worked well.

Then i uploaded one of my DivX-AVI's to the server -
the upload went to 99% and stalled!?!?!

I took the AVI and removed most of the frames, thus
bein able to reduce the file in question down to a size
of ~160KB, so i could to attach it to this mail. When i
try to upload this file to a Filezilla-server
configured as above, the first ~32 KB are uploaded and
then the upload stalls!

BTW: When i configure the server zo use Z-Compression,
the upload seems to work. Also in Active-mode in my
local network the upload works. But using
Filezilla-Client or IE6.0 in Passive mode, the upload
stalls after the first 10-32 KB.

The same behaviour also accurs, if i contact my server
from outside (e.g. from my university with the standard
ftp console program) any try to upload from there.

Auf bai...

Mighty Knife

[Tim Kosse]

For passive mode, you should generally use a port range of
at least 10 ports above 1024, for example 5000-5010, a too
small port range can cause a lot of problems.

Also, please make sure you're using the latest firmware
version of your router.

One last possibility would be firewalls or anti virus
software, they can have lots of strange effects sometimes.
Please try with those programs disabled. Keep in mind that
despite the firewalls telling you otherwise, some can only
be disabled by deinstalling them.