Depend on what you had configured on the router. Did you configure the default authentication method?. If so, where are the default authentication method pointing to for authentication? To a tacacs+ server? Do you have a back door to local database? Have you created the local user database? Since you are getting the user/password prompt, it appears that you have had the default method list configured. Question is where is it pointing to for authenticarion. If its to tacacs+ then local or enable then you may want to shut down the tacacs+ services and then login to the device with fall back method whether its local, enable password to line password. If you are not sure about the config and haven't saved the config, then the best bet is to reload the router.
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...