Snowcap refers to the rogue system detection components, but RSD sensors shouldn't be trying to talk to agent handlers... have you got any machines still running olod RSD sensors, maybe?
Yes it's maybe possible tha we've got 2 or 3 old workstations which still got an old rogue agent running.
I'll check it.
I found 5 clients with a rogue sensor which I just removed.
I'll check tomorrow if the messages disappear from the error logs