Error on a request to write a media location identifier during
long backups to Deduplication folders across a WAN.
Article:TECH153943  |  Created: 2011-02-22  |  Updated:
2013-01-03  |  Article URL Article Type Technical Solution
During a backup to a deduplication folder, when new media is
required, an error pops up indicating that Backup Exec could not
write a media location identifier (file mark) to the media.
 This can happen if the job is taking a long time to fill up a
piece of media or complete a job (more than 30 minutes per
media).  During this time, Backup Exec holds open a session that
is not transmitting any data.  A variety of devices along the
route between the remote agent and the media server can
interpret this lack of data transmission as an abandoned session
and arbitrarily terminate the session.  This problem typically
happens at approximately the same amount of time into an
operation.  That is, if the job keeps failing at the the same
times (e.g. 1.5 hours), then this may be the cause o