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I would suggest that you review the following solutions by going to the following and searching for "network scan"
http://www.support.xerox.com/support/workcentre-3315-3325/support/enus.html
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Hello –
We have a WC 3315. From time to time the user from machines disappear from the "Network Scan > Scan To" list.
The message is "not available"
What is the solution?
Thanks,
Jeno