I had an SSIS package fail in a script task this morning. As part of the why process I opened up one of the files it was processing and got this message:

I get the idea and I’ll hunt around to find what has it open, but I’m bemused at ‘another user’ which is either a really great domain user name or a fun default when no user name is available – presumably the latter. The package is using GetSchema to get the sheet names and I suspect it is/was the cause, but I wonder why no useful user name provided?

In the course of a quick search I found this post that doesn’t answer that question, but does go into a lot of detail (look at the flow chart!) on all the various ways it can happen.