What does this message mean?
system,error,critical login failure for user via local
i guess “local” is serial port, but i have no connections to serial port
i guess someone try to login from LAN 
but why “via local” , not “via ether1”?
you can see everyone will try to attack your machine in system logging when disable=no
be sure, you must make securely of your router from public, local, unwire interface 
regards
Hasbullah.com
“via local” this is “keyboard”… my router is PC x86… someone from coworkers check router’s heartbeat by typing this trash on keyboard 