Do you have a regular UDD scan enabled for the subnets containiing these devices? If so, do you have OS Fingerprinting enabled in the configuration? The ports you list aren't any standard LANDesk ports but during the fingerprinting tests many ports will be checked by the nmap process. Perhaps it is that detection routine that is causing this?
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I have a daily scan for unmanaged devices. T
The items had a checkmark:
Discover devices using a standard network scan
IP OS Fingerprinting
I unchecked IP OS Fingerprinting. I'll see what happens over the next couple days and report back.
I think that did it.