I was running an import of 1800+ users and the process bombed around 500 users.  I ran it again, and it bombed around the same number of users (slightly less).

Interactive User Import failed: System.Threading.ThreadAbortException: Thread was being aborted. at DataSprings.DNN.Modules.UserImport.UserImportProcess.DoWork()

I was running some SQL during the import to update the UserPortals.Authorised = 'True', but I removed that to test further. 

It was able to import a few more users, but not all.  Any ideas why the thread is choking?

Thanks!