Hi,
Sorry for  disturbing again, 
I can't create a local mirror, I tryed many and many times .
Help please
Here is what I have done:
I create a local mirror for lenny ( just to test so I mirrored contrib i386  about 200 MB), here is the tree (remove some letter directories):
 
I used the command 
apt-mirror
the file contains  /etc/apt/mirror.list
deb 
http://ftp.fr.debian.org/debian lenny  contrib 
###deb-src 
http://ftp.us.debian.org/debian unstable main contrib non-free
here is the tree :
debian225:/var/www# ls debian
dists  pool
debian225:/var/www# tree -L 3 debian
debian
|-- dists
|   `-- lenny
|       |-- Contents-i386.gz
|       |-- Release
|       |-- Release.gpg
|       `-- contrib
`-- pool
    `-- contrib
        |-- a
        |-- b
        |-- c
        |-- x
        `-- y
40 directories, 3 files
I used the official netboot lenny  thru PXE (dhcp)
evrything is fine at boot from a remote client until  the choice of  the mirror to complete, 
If  I choose  an official one    for example  
ftp://ftp.fr.debian.org/    then  debian      It runs fine
if I choose my local repo :
http://172.19.6.225/      then  debian     I get the error 
bad archive error    
the specified archive mirror is either  not available      or  doesn't have a valid  Release!!!!!
The file Realease and Release.gpg are exactly the same as files in official repo, I check them !!!
Is there a special thing to add to the installer ?
here is the pxe directory
debian225:/home# tree -L 3 /var/lib/tftpboot/ 
/var/lib/tftpboot/
|-- debian-installer
|   `-- i386
|       |-- boot-screens
|       |-- initrd.gz
|       |-- linux
|       |-- pxelinux.0
|       `-- pxelinux.cfg
|-- pxelinux.0 -> debian-installer/i386/pxelinux.0
|-- pxelinux.cfg -> debian-installer/i386/pxelinux.cfg
`-- 
version.infoI add the line  to apt.conf ??
APT::Get::AllowUnauthenticated 1 ;
to disable the test authencity (if any pb of  Release.gpg ), not sure that it does something,  because   If I have to 
    do something I have to do in   /var/lib/tftpboot/debian-installer  which contains the kernel
cat /etc/apt/apt.conf
I
http://172.19.6.225/debian/
gives correct directory:Index of /debian
Ofcourse no README and other files, are not  required normally.
PLEASE  HELP
best regards
bela