Hello, I'm using LiteSpeed 4.1.12 and PHP 5.3.10. When I try to send files greater than 2147483647 bytes (2GB) the download doesn't start. Removing the header Content-Length the download does start but without file size. It looks like a 32bits limitation but both programs and the OS (Linux 2.6.38-8-server Ubuntu x86_64) are 64 bits. Any ideas what may be causing the problem? Thanks.