You need to create a Location awareness policy so that when clients go off the network, they switch to a location/policy which is configured to get updates from Symantec Liveupdate.
What version of SEP are you on, 11.x or 12.1?\
This KBA applies to 12.1
Enabling location awareness for a client
Article:HOWTO81170 |
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Created: 2012-10-24 |
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Updated: 2013-01-30 |
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Article URL http://www.symantec.com/docs/HOWTO81170 |
https://www-secure.symantec.com/connect/forums/updating-defintions-when-offline-sep-server