Msg 7399 – The OLE DB provider "Microsoft.Jet.OLEDB.4.0" for linked server "<linked server>" reported an error. Authentication failed.

I’ve seen this one a few times lately.   In SQL Server there is a linked server to Access\Excel etc. Most of the times it works well, however, every now and then we get this:   OLE DB provider “Microsoft.Jet.OLEDB.4.0” for linked server “<linked server>” returned message “Cannot start your application. The workgroup information file…

4