As posted in the hacker thread : http://www.lfsforum.net/showthread.php?p=1737657#post1737657

WARNING : THIS IS A TEST!

DEDICATED SERVER - ONLY FOR HOSTING!

www.lfs.net/file_lfs.php?name=LFS_S2_DEDI_6B4.zip

Changes from 0.6B to B3 :

Improved checks on packets received from joining guests
Improved checks on validity of user names while connecting
User names now confirmed with master server after connection
Cleaned up and removed some unused code

Changes in B4 :

Two more hacking checks on packets sent by connecting guests
Removed message "Got master packet" from network debug output
No buffer overflows from hangs or operating system time changes
Auto restart after buffer overflow on host to avoid bugged state

You only need the exe (from the zip) if you are updating an existing installation.