What is a common cause of authentication failures?

Authentication failures often occur due to incorrect credentials. When users attempt to access systems or applications, they are typically required to provide a username and password. If the user inputs an incorrect username or password, the authentication process will fail, preventing access. This issue is one of the most frequent causes of login problems, as users may forget their passwords, mistype them, or use the wrong username.

Other factors, such as expired IP addresses or network issues like congestion and high latency, can impact overall network performance or connectivity but do not directly cause authentication failures. While network congestion and delays can lead to a poor user experience, they would not typically result in an authentication failure unless they caused the connection to drop during the authentication process itself, which is a less common scenario.