long delay for authentication failure

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May 28th, 2008
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Any guru here can help me on explaining a question about general authentication:


Normally when the authentication passes, it takes little time to see the result but when it fails, it takes much longer time to get a fail message. Why is that so?

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Jon Marshall Wed, 05/28/2008 - 23:27
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It really depends on why it is failing. If it is failing because it does not get a response from the authentication server then it will try any other authentication servers in your list. This could take some time.


If the authentication server responds with either a success or failure there should be no real difference in the time taken.


Jon

xianglingzj Thu, 05/29/2008 - 02:20
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I think a lot of us have ever experienced this: When login to a TACACS+ enabled router, if you key in the correct pwd, it will grant you access almost in no time; whereas if you have any typo... hoho, better to get a cup of coffee from vending machine.


I would like to know what is happening within the long delay.

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