I can only hazard a guess. It looks like something is trying to login in to your sensor, and it is most likely automated.
Is it possible that some kind of network management system is probing your system? Do you have TELNET enabled? WhatsUp from Ipswitch is known to tickle telnet servers with a generic account, I believe, in order to determine the status of the server (up or down)
Another possibility is that you have a RDEP / SDEE client with a misconfigured username (read: typo) trying to access alarms on the sensor.
Have you sniffed your Command and Control interface to see what the offending packets look like?
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...