I have 3 iMac's at 2 different locations. I can Screen Share using iMac without problems at location 1, however at location 2 it always fails. This isn't the first time I've ever seen this type of issue, and I've updated every Mac to the newest updates I restart the machines, log out, delete iChat accounts, etc but nothing works. Any idea why some people get these errors? All new iMacs that were bought 2 months ago, trying to communicate with a MacBook Air and Pro also purchased in that time frame.