11-07-2011 05:05 PM - edited 03-10-2019 06:32 PM
I have a Cisco ACS 4.2 running on Windows 2003. Authentication is working fine for various cisco devices like routers, VPN concentrator etc.
Today I added a 48 port L2 switch as a AAA client, the authentication works fine. However I see many failed login attempts from this L2 switch with the user "C"
Message-Type: Authen failed
Caller-ID: async
Authen-Failure-Code: External DB user invalid or bad password
NAS-Port: tty0
What is causing this failed login?
Solved! Go to Solution.
11-14-2011 08:32 AM
If the console port on the switch generating the spurious login errors is connected to a device offering remote access to the console port, then it's likely that some output from this device is causing the bogus login attempt.
If this device is an IOS router with a bunch of asynch ports add "no exec" to the line connected to the switch console port.
11-07-2011 06:05 PM
I'm willing to bet you 3:1 odds that you have something connected to the AUX port, like a terminal services port, modem, etc., and it is causing the attempted logins with spurrious interrupts.
-Jeff
11-07-2011 08:35 PM
Only console port is connected to a console router and telnet is also allowed on vty 0 4. Auxilary port is not connected.
11-14-2011 08:32 AM
If the console port on the switch generating the spurious login errors is connected to a device offering remote access to the console port, then it's likely that some output from this device is causing the bogus login attempt.
If this device is an IOS router with a bunch of asynch ports add "no exec" to the line connected to the switch console port.
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