Syslinux - Aug 2013 - HTTP protocol support.

Hello All.

I `m trying migrate to version 6.01 from 5.01 and without luck.
I`m still on 5.01   and I use gpxelinuxk.0 5.01 but I rename it to pxelinux.0
my pxelinux.cfg/default 
label default
                MENU LABEL ^Custom PE
                KERNEL http://deployment/sources/common/pxe/memdisk
                APPEND iso raw        
                initrd http://deployment/sources/iso/CustomPE/AltPE_7.iso  
and it`s work fine.
If I replace files by new version. 
Pxelinux cannot load memdisk and iso (even if I put FQDN)  
Any ideas ?



Thanks. 
Vladimir Izmalkov