What type of message is associated with the issue of credentials being invalid?

The message that signifies issues with invalid credentials is connected to "Unauthorized/Login Failed." This type of message clearly indicates that the user's attempt to log into a system or application has been unsuccessful due to incorrect username or password combinations, or other related authentication errors.

When invalid credentials are provided, the system recognizes that the user's identity cannot be verified, leading to an explicit failure message rather than a more generic error. This specific context is crucial for users to understand that they need to check their login information and try again, as opposed to other messages which may indicate connection or technical issues unrelated to user credentials.

In contrast, a socket error typically relates to problems with the underlying network connection, a connection timeout indicates that a request took too long to respond, and a formatting warning pertains to issues with the structure of data being sent or received. None of these imply problems specifically with user authentication, making "Unauthorized/Login Failed" the most relevant choice in this scenario.