When a user reports a login failure despite entering the correct credentials, what is a reasonable initial step?

When a user reports a login failure despite entering the correct credentials, what is a reasonable initial step?

• A. Verify the username and password, then check network connectivity and domain membership.
• B. Immediately reboot the computer.
• C. Change the BIOS settings.
• D. Reset the router.

Answer: (A)

Authentication relies on two things: that the credentials are valid and that the device can reach the authentication service (such as the domain controller) to verify them. When a user sees a login failure despite entering the correct password, the best first step is to re-verify the credentials and ensure the device can contact the authentication service. Check that the username format is correct (for example domain\username or user@domain), retype the password carefully, and confirm there are no keyboard issues like Caps Lock or layout mismatches. Then ensure the network path to the authentication service is solid: the computer is connected to the network, DNS can resolve the domain, and the machine is joined to the domain so that it can authenticate against the domain controller. If these checks pass, you can investigate other factors such as account status or time synchronization. Rebooting, changing BIOS settings, or resetting the router don’t address the underlying need to verify credentials against a reachable authentication service, so they aren’t the most prudent initial steps.

Authentication relies on two things: that the credentials are valid and that the device can reach the authentication service (such as the domain controller) to verify them. When a user sees a login failure despite entering the correct password, the best first step is to re-verify the credentials and ensure the device can contact the authentication service. Check that the username format is correct (for example domain\username or user@domain), retype the password carefully, and confirm there are no keyboard issues like Caps Lock or layout mismatches. Then ensure the network path to the authentication service is solid: the computer is connected to the network, DNS can resolve the domain, and the machine is joined to the domain so that it can authenticate against the domain controller. If these checks pass, you can investigate other factors such as account status or time synchronization. Rebooting, changing BIOS settings, or resetting the router don’t address the underlying need to verify credentials against a reachable authentication service, so they aren’t the most prudent initial steps.