I have a few 3U servers that are on a 4 post rack. the rails allow the server to slide out and lock in place.
How do I get the server off the rails ?
(I wasn't the guy who installed them)
Pressing the clips on the side of the rails only allow the server to slide back in from the lock position.
Depends on the rack, but generally you have to either unscreew it from the rails, or (more commonly) there is a second set of clips/locks that prevent it from being pulled out completely.