When you receive "Incorrect password" despite entering correct details, what might be the issue?

The scenario where you receive an "Incorrect password" message despite entering the correct login details can often be linked to the expiration of user credentials. When user credentials expire, even if a user enters the right password, the system will not authenticate the user, leading to an "Incorrect password" notification. This is a common security measure to ensure that users regularly update their passwords and that accounts do not remain active indefinitely without periodic verification of the user's identity.

A misconfigured MAC address block list, a system clock mismatch, or an access control list error may affect access in various ways, but they do not directly cause valid user credentials to be rejected. A MAC address block list would typically deny network access based on the physical address of the device rather than user credentials. A system clock mismatch could cause issues with time-based authentication methods but would not cause a direct password error for valid credentials. An error in access control lists could prevent access to certain resources but would not inherently flag the password as incorrect.

In this context, expired user credentials are the most likely cause of the issue described.