We have cisco 1751 router in which we have configured username & pssword but no login local command has been entered in line vty 0 4.
When we try to login into router, everytime , it asks for username followed by password . We are able to enter into router.
Secondly, after we enter this, we issue enable command. Then it asks for secret password. If in first attempt we fail to enter correct password, router comes at > prompt without asking for two more attempts.
I have looked at the config that you posted and believe that I understand what is happening. You do not have login local configured on the vty lines. But you have enabled aaa new-model. I believe that the aaa implementation is defaulting to login local as the default behavior and is prompting for user name and password. I believe that if you attempt to configure login local on the vty at this point that you would get an error. If you want to verify this you could configure no aaa new-model. This should allow you to configure login local on the vty lines.
Also while it is normal to give three chances to enter the user level password it is normal to have only a single chance for the enable password. If you enter an incorrect password, it is normal to get the error message and to have to enter the enable command again for another attempt.
which password are you trying, the one configured with ´enable´, or the one configured with ´enable secret´ ? The ´enable secret´ has precedence, I would take the ´enable password´ out alltogether, since it has no use. Can you try and remove the ´enable password´ and check if your problem persists ?
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