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I originally setup the macmini to run via screensharing w/o screen keyboard or mouse
This worked fine when I originally did the leopard setup: I could login using any of various accounts to control the default account. Now I've been doing multiple updates: leopard -> final leopard update -> snow leopard upgrade -> final snow leopard update -> lion upgrade. Somewhere along the line, apple may have changed some of the protocols: now, if you try to control default userX's screen by screen-sharing, it's cool if you do it from another machine as userX using userX's password; but if you try to do it from another machine as userY using userY's password (assuming preferences have been set to allow this), then userX gets a popup box asking whether or not to grant permission, and userY gets to wait until userX gives the OK. I don't see that, of course, if I don't have a screen connected to the machine
Similarly, if I decide to log into my lion macbook from a snow leopard machine, by screen-sharing, I succeed if I login as userX when the lion macbook is already controlled by userX. But if I try instead to access the lion macbook screen as userY (even if preferences have been set to allow this), I wander into some wasteland of limbo. An irritating feature of this is that the NetAuthAgent window doesn't have a kill button and it doesn't go away when you you quit screen-sharing or shutdown the machine whose screen you were trying to access: no, you can quit or force-quit it from Activity Monitor (in which case it's likely not to restart again when you need it), or you can reboot
Moreover, for some reason the lion macmini and the lion macbook aren't behaving entirely similarly, although it seems to me the screensharing preferences are the same
:grr:
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