I've seen this error reported and it's usually because the OS of the NSM needs updating.
I'm trying to add an SA2000 (OS 7.0R1) to an NSM running (2009.1r1)
Is this a compatible configuration?
Exact error is:
We weew unable to parse a usable OS version from the device. The device returned osVersion:ive-sa7.0R1, platform: SA-2000
Thanks