yum problems

[Georg E Schneider <georg georgs org>]

It's the same if I use yum from FC2-test1 or the development package 
from yum.
If I download a package whitch is ca. in 20 MB size yum seems to hang
(package completly downloaded, but the next wont start) 
if it's over 30 or under 15 MB yum works fine.
I don't know what it is because ther are absolutly no messages in 
yum.log log/messages etc...
Im using the ftp-server from tu-chemnitz.

greetings
Georg E Schneider