Having a bit of a nightmare with this remote login for my ASA. I get the prompt on Putty, input admin as I set, and then input the password that I set but get denied. I then consoled in to change the password incase I typed it wrong but again I was denied.
I just typed 'username admin password xxxxx' under config t. Have the default gateway, and everything seems to be in place otherwise I wouldn't be getting the prompt to login!?
Try out this as well....
crypto key generate rsa modulus 2048
Have you set the AAA configs in the ASA?????
aaa authentication ssh console LOCAL
Please do rate if the given information helps.