% Error in authentication

[Nishan]

we are having a problem in WS-C2960X-48FPD-L when i am trying to enter in the privilege mode its showing % Error in authentication through console and shh.

please note: we dont configure the tacacs 

[balaji.bandi]

if you made a config and if you wrote the config by issuing a command write, then you need to follow the password recovery procedure.

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-2950-series-switches/12040-pswdrec-2900xl.html

Once that is done you can use below config :

config t
!
enable secret cisco
!
username cisco password 0 cisco
!
line con 0
no login local
exec-timeout 0 0
privilege level 15
logging synchronous level 0 limit 20
stopbits 1
line vty 0
password cisco
login
transport input all (you can use only SSH if you like more secure)
line vty 1 4
password cisco
login
length 0
transport input all (you can use only SSH if you like more secure)
!
exit

Note : do not write until it was tested, so if you have issue you can reload device with basic config.

[Nishan]

Dear Balaji,

thanks for your information. 

The switches are in stack. so need to do only for one switch?

[balaji.bandi]

if this is stack, you need to bringdown whole stack and do the proceedure on the master switch. once you have access bring up other members.

[MHM Cisco World]

You probably config aaa new model and config aaa auth enable then you missing config password for enable.
I think you need recover enable password