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VSP 7400 Switch is Locked Out With a Warning "Maximum number of login attempts reached for console" Due to Unterminated Console Cable

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TitleVSP 7400 Switch is Locked Out With a Warning "Maximum number of login attempts reached for console" Due to Unterminated Console Cable
Symptoms
  • Just a serial console cable is connected to the console port on the switch and no terminating device e.g terminal server, PC or Mac connected on the other end.
  • Switch continuously logs below messages every minute
    1 2020-04-15T01:54:41.840-04:00 VSP-7400-48Y-8C CP1 - 0x000305f1 - 00000000 GlobalRouter SW WARNING Maximum number of login attempts reached for console. Lock out for 60 seconds.
    1 2020-04-15T01:55:47.247-04:00 VSP-7400-48Y-8C CP1 - 0x001985a0 - 00000000 GlobalRouter ACLI WARNING Blocked unauthorized ACLI access
    0-04-15T01:55:48.440-04:00 PThe previous message repeated 2 time(s).  
    1 2020-04-15T01:55:48.440-04:00 VSP-7400-48Y-8C CP1 - 0x000305f1 - 00000000 GlobalRouter SW WARNING Maximum number of login attempts reached for console. Lock out for 60 seconds.
    1 2020-04-15T01:56:53.846-04:00 VSP-7400-48Y-8C CP1 - 0x001985a0 - 00000000 GlobalRouter ACLI WARNING Blocked unauthorized ACLI access
    0-04-15T01:56:55.040-04:00 PThe previous message repeated 2 time(s).  
    1 2020-04-15T01:56:55.040-04:00 VSP-7400-48Y-8C CP1 - 0x000305f1 - 00000000 GlobalRouter SW WARNING Maximum number of login attempts reached for console. Lock out for 60 seconds.
    1 2020-04-15T01:58:00.446-04:00 VSP-7400-48Y-8C CP1 - 0x001985a0 - 00000000 GlobalRouter ACLI WARNING Blocked unauthorized ACLI access
    0-04-15T01:58:01.640-04:00 PThe previous message repeated 2 time(s).
Environment
  • VSP 7400
  • All supported software releases
Cause
  • An unterminated console cable presumably develops a floating voltage and triggers a perceived carriage return and continues to issue a login attempt on the console.
Resolution
  • Unplug the console cable or plug the DB9 to the PC
Additional notes

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