TROUBLESHOOTING
Try the following approaches to allow Domino to open the catalog file.
1. Stop the Domino server.
2. Create a backup copy of the DAOSCAT.NSF to send to IBM Technical Support.
3. Delete the catalog file.
4. Restart the server.
5. After Domino has recreated the catalog, use the Tell DAOSMgr Resync command to re-synchronize DAOS references.