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Backup Exec reports error 0xffff8101

Issue:

Backup Exec was running great, and all of a sudden, it starts erroring when backing up to tape. Error is 0xffff8101 "error on a request to query entity information". Makes a lot of sense that, right?

In our case, this was running on Windows Server 2003, with Backup Exec 9.1.

Fix:

Various pages talk about running a database repair, and even resetting the database to defaults and simply starting again. In our case, however, it was just that the Windows RSM (Removable Storage Manager) was suddenly interfering with the tape drive and BEWS didn't like it. Removing the tape device from the RSM (which is easiest to find in computer management) did the trick.

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