nstat_lookup_entry failed: 2

I've this problem too. I'm following this thread.

I have this problem as well and am following this thread for a response.

After seeing this post from last month I'm not confident we'll get a useful response.

nstat_lookup_entry failed errors when running Mail

I think it has something to do with the Open Directory. To run the tools that manage the OD configuration one should follow these steps (from: http://support.apple.com/kb/ht1528):

1. From the Apple menu choose System Preferences....
2. From the View menu choose Users & Groups.
3. Click the lock and authenticate as an administrator account.
4. Click Login Options....
5. Click the "Edit..." or "Join..." button at the bottom right.
6. Click the "Open Directory Utility..." button.

The application that will open up is actually called "Utility Directory", tho. This article:

http://support.apple.com/kb/TA21075

refers to OS X 10.2 "or later" and it has been updated Aug 5 2011. It says to disable the services, but whatever I deselect in Utility Directory doesn't apply. Still it should be a start for a better investigation.

For me this issue was solved by going into Login Options for my User Account (Sys Prefs / Users & Groups) and deleting the Network Account Server info (it had remembered my work's Exchange Server from an old email account). After I deleted that server, the errors went completely away.

Bizarre. I see the same error booting in verbose mode from an home made Lion Install USB key.