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Unknow issue - please help- Failed logs state failed attemps by unknown user for async??

Hi all,

I seem to be getting lots of failed attemps in my logs that look below.. We have checked the particular device and theirs nothing plugged into it?

Any help would be great.. i have checked this post but there was no valid answer..

https://supportforums.cisco.com/message/852985#852985

Message-TypeUser-NameCaller-IDAuthen-Failure-CodeAuthor-Failure-CodeAuthor-DataNAS-Port
Authen failedasyncInvalid characters in usernametty0
Authen failedasyncInvalid characters in usernametty0
Authen failedasyncInvalid characters in usernametty0
Authen failedasyncInvalid characters in usernametty0
Authen failed @@asyncInvalid characters in usernametty0
Authen failedasyncInvalid characters in usernametty0
Authen failedY[@asyncACS user unknowntty0
Authen failed2asyncInvalid characters in usernametty0
Authen failed$-asyncACS user unknowntty0
Authen failed(XPasyncACS user unknowntty0
Authen failedPBasyncACS user unknowntty0
Authen failed@asyncACS user unknowntty0
Authen failed%%asyncACS user unknowntty0
Authen failedIasyncACS user unknowntty0
Authen failed$@asyncACS user unknowntty0
Authen failed#NAME?asyncACS user unknowntty0
Authen failedHmasyncACS user unknowntty0
Authen failedIi$asyncInvalid characters in usernametty0
Authen failed%asyncInvalid characters in usernametty0
Authen failedasyncInvalid characters in usernametty0
Authen failed!I$asyncACS user unknowntty0
Authen failedHI @asyncACS user unknowntty0
Authen failed[asyncACS user unknowntty0
Authen failed m HmasyncInvalid characters in usernametty0
Authen failed@[asyncACS user unknowntty0
Authen failed@ @mULasyncACS user unknowntty0
Authen failed[asyncACS user unknowntty0
Authen failedasyncInvalid characters in usernametty0
Authen failedIasyncACS user unknown

tty0

1 REPLY

Re: Unknow issue - please help- Failed logs state failed attemps


Hi John,

Do we have any modem or terminal server connected to this device for out of band management? In these type of issues the problem is with the modem or term ser. It echo's back exec information from the console. The console interprets these message as login requests. This is extremely common. If that is the case then we need to reconfigure modem or term server, so that it does not echo.

If it's an IOS terminal server, the "no exec" command resolves the issue.  If it is a modem, it must be reconfigured so that it no longer echoes.

Regards,

~JG


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