Login on-failure log message problem

[brandon.m.strode1]

Please see my log message below.  Note that the user section is blank.  Is there a reason why this would be left blank? As a side note I am currently running radius on my network if that makes any difference.

Feb 21 19:57:47.898: %SEC_LOGIN-4-LOGIN_FAILED: Login failed [user: ] [Source: x.x.x.x] [localport: 22] [Reason: Login Authentication Failed] at 13:57:47 CST Wed Feb 21 2018

[lash]

I have this issue too on multiple switches - version 15.2(4)E5 

[brandon.m.strode1]

I have even upgraded to a higher end switch and upgraded to the recommended version and this error is still occurring.  

cisco WS-C3650-48P

Cisco IOS Software [Denali], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 16.3.5b, RELEASE SOFTWARE (fc1)

*Mar 16 15:16:44.409: %SEC_LOGIN-4-LOGIN_FAILED: Login failed [user: ] [Source: UNKNOWN] [localport: 0] [Reason: Login Authentication Failed] at 10:16:44 CDT Fri Mar 16 2018

I am doing this through console which is why the source is unknown.  The login success messages come through with the user just fine.  From what I have read this is a bug that has been around for a while.  I wonder if anyone has found a fix or if Cisco is ever going to bother with fixing this.

[franscisco]

Got it solved with my switch this way:

SWITCH01(config)#crypto key zeroize rsa

SWITCH01(config)#crypto key generate rsa