to check if systems are not connect to manager
click on monitor - logs - select computer status
 click on advanced options the ( blue link)
now at the bottom select online status slect OFFLINE
create a report.

For offline clients you can select the above report however you should have enable Unmanaged detector and create reports for that..it will tell you which clients do not have SEP installed on them.. 

you may try this document too.

Best Practices: When to use the "Find Unmanaged Computers" or "Unmanaged Detector" features in Symantec Endpoint Protection 11.0
http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2008030514404548

Thanks Rafeeq.

Vikram, how do I find out if I've got the Unmanaged detector enabled?  That sounds like what we want.

Dan

 check this discussion

http://news.support.veritas.com/connect/forums/how-do-i-find-machine-thats-set-unmanaged-detector

 You need to manually Enable it by right clicking the client.

Read the article and the article inside that article aswell.

Best Practices: When to use the "Find Unmanaged Computers" or "Unmanaged Detector" features in Symantec Endpoint Protection 11.0

http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2008030514404548

Configuring a client to detect unknown devices
http://seer.entsupport.symantec.com/docs/330968.htm

Find Unmanaged Clients on a remote network location using the Unmanaged Detector
http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/6970e5f4ae20b52149257635005543c4?OpenDocument

What does it mean to set a client as an Unmanaged Detector?

http://service1.symantec.com/support/ent-security.nsf/854fa02b4f5013678825731a007d06af/8e056b2507538a29882574b10077d6db?OpenDocument

Thanks all.

So it is my understanding that there is "no" pre-defined report that tells us what computers are not protected.

Dan

Thank you, that helps a lot.