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With 10.6, I routinely had two accounts logged into the Mac while I was working - my personal and my work account. I switched between them as needed and this worked fine. For example, if I had an IM client running under the work user and switched to my personal user and then back again to the work user, everything was ok. The work user's IM client stayed connected the whole time.

With 10.7, it looks like switching to another account renders the network connection inactive for the account that is no longer in use. When I switch back to the work account now, the IM client has to reconnect and the VPN attempts to reconnect.

Is this new behavior documented somewhere and is it configurable?

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Is the IM client going through the VPN? The reason I ask is because I cannot reproduce this problem on OS X Lion. –  Nathan Aug 9 '11 at 15:40
    
I'm seeing this exact behavior on 10.7.2. When I pick switch users in fast user switching, the new login screen airport icon dims, then lights up again. Seems like a brief interruption as soon as fast user switching is selected. I'm opening a radar bug on this. –  jtatum Oct 10 '11 at 20:44
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Not really - Lion is now able to kill processes that appear to be idle and unused. Fast user switching adds more load on memory and processor (due to the simple fact that more is now running), increasing the chance this will trigger.

Also, the changes to allow multiple simultaneous logins may have changed the API which will need the VPN client to request to stay connected or otherwise start itself outside the user space to survive a switch in Lion.

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