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After logging on, I see this dialog box pop up. Whenever I dismiss it, it reappears 30 seconds later. (Stealing focus at the same time! Grrrr!)

There was a problem connecting to the server "Slate".

"Slate" is my old iMac, which is sitting on the desk next to me, turned off. How can I stop my new Mac from constantly trying to connect to my old one? Both are running 10.7.1.

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Did you set up a shortcut to automatically mount the drive? Looking in System Preferences > Users and Groups > Login Items. Or, is there an application/document that's automatically loaded on launch that points to the iMac? – chrismanderson Sep 21 '11 at 23:31
@ChrisAnderson: No, nothing that I can see. Is there any way to detect which application is responsible for connecting? – Brant Bobby Sep 21 '11 at 23:39
Nothing specific that I know of. I'd just check the Console if you haven't already, possibly you can find the error there. – chrismanderson Sep 21 '11 at 23:42

Check System Preferences>Accounts>Login Items to see if there is a disk that is supposed to mount when you login. Make sure you check all of the user accounts.

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up vote 2 down vote accepted

I'm pretty sure this was happening because when I logged out, I was running an app which was located on the other computer.

I logged off and unchecked the "Reopen windows when logging back in" box, which stopped Lion from trying to reopen the app the next time I logged in.

Log Out dialog

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Good answer. But one pro tip: If something like this happens again, use lsof from Terminal. That is a Unix tool to show you the list of open processes. And if you run it like this sudo lsof | grep Slate the output of lsof gets filtered through grep and you could then see exactly what application/process. Is attempting to use Slate. – JakeGould Oct 10 '14 at 2:38

I suspect you are connecting to a legacy file server as described in the kbase article below.

We saw similar pop ups but clearing up our mounts addressed the issue.

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We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

I managed to eliminate it by adding a folder from the named server to the "login items" and then deleting it. Weird, but it worked for me. Hope it helps. – user68842 Jan 28 '14 at 16:42
I had exactly the same problem, with my new Macbook continuously attempting to reconnect with my old Macbook which I had at one time connected to through the same wifi network. A similar alert would appear on my screen once every few minutes or so. I followed the above directions as far as "Looking in System Preferences > Users and Groups > Login Items." Then I clicked the lock icon in the bottom left corner of the window and entered my password to enable changes. I then clicked on the Guest User icon which appeared directly under my Admin Icon. In the new window I clicked to disable "Allow gu – user68887 Jan 29 '14 at 2:44
I had this problem as well; at login my Mac (iMac running 10.7) was trying to connect to an old Windows Home Server that I have removed. I found that there was a .../Login Items entry that was trying to mount a volume from that old server. Deleting that entry solved the problem. Thanks for the tip. – ifdefmoose Feb 22 '14 at 20:08
I found a similar issue with teacher computers trying to connect to an obsolete server. I found the auto-connect file(s) in MacintoshHD/Users/Shared. Then I deleted them. Problem gone! – user90394 Sep 11 '14 at 21:41
But how did you find the auto-connect files, Marie? – user99031 Nov 3 '14 at 21:59

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