All of a sudden some of our SQL backups are failing with this error: Operating system error 64(The specified network name is no longer available.). These backups are being written to a different server, then backed up to disk. To rule out DNS issues, I changed the failing ones to use IP. Still failing. Turned off virus scanner, so it wouldn't scan while the file was being written. Still failing. The only thing that has changed was the applying of the June Security Patches.