There was once a time when all this worked flawlessly. After an update i believe, cant remember which one, I've had problems. I'll say in advance reboots, log outs, permission repairs, and disk repairs do not solve. I can get screen share to work by using a "work around" otherwise it doesn't work as it should. It should be noted that while during my google researching, i found references to "netauthagent". it seems to be the service responsible for screen share?? it isn't running on the imac (server) as indicated by activity monitor. a manual search an launch won't engage it either. I am running 10.6.8 on both client (macbook) and server. Working method: finder>go>connect to server> then manually connect to "vnc://192.168.1.2", at which point it ask for authentication, which once provided works flawlessly Non Working Methods: finder>imac(via sidebar)>Share Screen at which point it asks for authentication and says authentication failed finder>go>connect to server> then manually connect to "vnc://nanuimac.local", at which point it asks for authentication and says authentication failed it should also be noted that accessing imac file system via sidebar DOES work and accepts authentication my iphone's "iteleport" app (a remote desktop screen sharing app) also works no problem. Any clues as to whats going on here? Or where to begin attacking this problem?