firewallmacosmessagesscreen-sharing
Both computers are running OS X 10.8.4
When trying to initiate the screen sharing feature, the other computer gets the request, then clicks "Accept" but thats as far as we get.
Then we see this:
I have posted the contents of the "Details" section:
http://pastebin.com/raw.php?i=yWYYCbgv
I am thinking we may need to open some ports on the firewall. Anyone know which ports need to be open? Or if this is even the issue.
I've had never any problems with upgrades and never lost any files.
You should make a backup — or better, make a bootable clone of your current hard drive:
Until you're certain that Lion works perfectly, keep the clone around - several months is usually enough time. If you ever need any files from it, just attach the drive and drag-and-drop them. If something goes really horribly wrong, you can boot into the clone, and then clone it back to the internal drive (you'll lose any changes made since you installed Lion). This second drive is really valuable for when you discover three months down the road that one seldom used piece of software won't work on Lion. You can reboot into Snow Leopard where everything still works and get that one task done. It's a great lifesaver and means you can start using Lion rather than checking that every little thing works perfectly right after the upgrade.
EDIT: Thanks Trombone for editing my broken-english post, but please, never add your own ideas into my post. My solution uses pure apple tools, so why bother with SuperDuper, when you can do it with nice clean install and Migration Assistant.
I never recommend any third-party products when things can be done with default Apple SW. Of course, you can prefer SuperDuper, it is your way - but not mine. Please add another answer explaining how to use SuperDuper or other awesome tools so that people can have a choice. Let's keep this solution needing no additional tools.
OK, I sussed it out. You can still do it, it's just that the way you do it is based on context rather than using the appropriate command.
Basically, to use the virtual display, you need multiple user accounts on the target machine, and you need an account to be already logged into the target machine such that you can login a 2nd time using the virtual display. Any account you wish to log into obviously needs the associated sharing rights enabled. Then follow the following logic:
If you want to use the virtual display for privacy reasons, you cannot simply switch to it like you could in 10.7, but you could simply leave the target machine with Guest logged in on the Hardware display to allow you to login as your primary user on the Virtual one.
Best Answer
Try opening up port 5222 (for iChat/Messages).