It's possible that CC integration isn't enabled on the server?
New version! Better still, new features! v2.1.0 adds:
+Support for many mods' wrenches, including Buildcraft, IC2, ProjectRed, UE, and Railcraft. Did I miss some you use? Tell me, it's dead simple to add more!
+Support for closing sides of carriage motors/engines/etc. Sneak-clicking them will close the side, after which they will not search for a carriage in that direction.
+Carriage adaptors. These function like carriage drives, except instead of requiring redstone or a computer signal, they pick up adjacent carriages when they are moved by RemIM. (Their sides can be closed, like other drives'.)
+A texture for transduplicators.