Showing results for 
Search instead for 
Did you mean: 

C3750 Stack Login from to failed

Hello everyone,

We see on a WS-C3750G-24TS-1U Stack of 2 Switches logins with source to destination:

IOS Version: 12.2(55)SE1

Switch1# sh tcp brie

TCB       Local Address           Foreign Address        (state)

05198EAC         FINWAIT2

063D5898         FINWAIT2

063D3EA0         FINWAIT2

04E65DF0         FINWAIT2

051989F0         FINWAIT2

04E5A48C         FINWAIT2

062DD650         FINWAIT2

05195994         FINWAIT2

05195E50         FINWAIT2

051967C8         FINWAIT2

04ED7930         FINWAIT2

04E601B0         FINWAIT2

0519DA08         FINWAIT2

04E64B00         FINWAIT2

05194B60         FINWAIT2

04E62A18         FINWAIT2

04E67498         FINWAIT2

051954D8         FINWAIT2

04F6D16C         FINWAIT2

04F6E5E4         FINWAIT2

04E66B20         FINWAIT2

0518E07C         FINWAIT2

04C14868         FINWAIT2

Switch1#sh users all

    Line       User       Host(s)              Idle       Location

   0 con 0                                     00:00:00

*  1 vty 0     test    idle                 00:00:00

   2 vty 1     % Username idle                 00:00:00

   3 vty 2                                     00:00:00

   4 vty 3                                     00:00:00

   5 vty 4                                     00:00:00

   6 vty 5                                     00:00:00

   7 vty 6                                     00:00:00

   8 vty 7                                     00:00:00

   9 vty 8                                     00:00:00

  10 vty 9                                     00:00:00

  11 vty 10                                    00:00:00

  12 vty 11                                    00:00:00

  13 vty 12                                    00:00:00

  14 vty 13                                    00:00:00

  15 vty 14                                    00:00:00

  16 vty 15                                    00:00:00

Switch1#sh ver

Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(55)SE1, RELEASE SOFTWARE (fc1)

Technical Support:

Copyright (c) 1986-2010 by Cisco Systems, Inc.

Compiled Thu 02-Dec-10 07:46 by prod_rel_team

Image text-base: 0x01000000, data-base: 0x02F00000

ROM: Bootstrap program is C3750 boot loader

BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

Switch1 uptime is 13 weeks, 2 days, 8 hours, 12 minutes

System returned to ROM by power-on

System restarted at 07:02:15 MESZ Sat Jun 18 2011

System image file is "flash:c3750-ipservicesk9-mz.122-55.SE1.bin"

Does anyone has an explanation for that ?

It looks like one switch is telneting to the other within the stack.

But why ?

We recognized it because we see a login failed on the Tacacs server.




Accepted Solutions

Makes sense..You may want to file a bug for same.

View solution in original post


Hi Emanue,

You caught that ...Well,thats how stacking concept is internally implemented....One switch telnets to the other within the stack.


Thanks for the fast responds.

But the problem is, that the Login failes and we see a log message on the TACACS Server. Is there a way to get rid of this Authentication failed "internal" attemps on the TACACS ?

Thanks !

I am not sure how we can get rid of this on TACACS server..Just wanted to know if this has any functional impact?..It may need to be fixed in that case

Well the impact is, that there are many messeges on the TACACS Server, that are useless and its hard to find any message that might be usefull. So it has a kind of a management or seurity impact if you like, beacuse we need to ignore hundreds and hundreds of messages a day but still check them in case of a usefull message.

Makes sense..You may want to file a bug for same.

hmm.... okay; I will open SR tomorrow.

Thank you very much for your explantion !!