Several of our workflows use a file transfer task to pick up any "old" files that might have been left behind by previous runs of a utility before we start a new run of that same utility. Since usually there aren't such files, we configure the workflow so that subsequent task(s) have a dependency of ENDED_OK_OR_EMPTY.
Occasionally (maybe once every couple months) we have seen this file transfer fail in an ENDED_NOT_OK, even though the report clearly says that no files exist:
20140513/040028.049 - U2000134 Thread '*FT(20730295)' started.
20140513/040028.049 - U0011407 FT '20730295': FileTransfer with partner 'A1004V-UC4A02A' started.
20140513/040028.372 - U0063016 FT '20730295': The file '/apps/ebsuite/frb/custom/auditreportwithipaddress/reports/OLD*' does not exist.
20140513/040028.372 - U0011409 FT '20730295': FileTransfer ended abnormally.
20140513/040028.372 - U2000135 Thread '*FT(20730295)' ended.