404 Error

Hi,

I just noticed that my TUX server doesn't return 404 even if the file
doesn't exist. No error, the browser just keeps loading until time out. 

My TUX version: 
tux-3.2.18-1

[root@ternate run]# cat /etc/sysctl.tux
net.tux.mode_allowed = 400
net.tux.generate_cache_control = 1
net.tux.generate_etags = 1
net.tux.generate_last_mod = 1

Any idea? Thank you very much.

--bk