5.27. When I edit a file protected by LIDS, it appears to lose it's LIDS protections. Why?

Many editors (e.g. vi) copy the file you are editing to a temporary file. All your changes are made to that temporary file. When you exit the editor, the temporary file is moved over the original file. This changes the inode of the original file and any previous LIDS ACLs that affected the file will no longer work. Type:

/sbin/lidsconf -U

To update the inodes in the lids.conf file.