What troubleshooting message indicates an issue with network connectivity?

The message indicating "Internet/network connection" is directly related to issues with network connectivity. This type of message typically arises when the device is unable to establish a connection to the internet, signalling a problem with either the local network, the internet service provider, or how the device itself is configured for networking. It serves as a clear signal that, regardless of the software or login details being correct, the device is not able to communicate with external servers due to lack of connection.

In contrast, messages about "Proxy 336 Error," "Invalid username and password," and "No audio" pertain to other distinct issues. A proxy error often points to configurations related to network routing rather than direct connectivity. An invalid username or password indicates a problem with authentication rather than network access. Lastly, "no audio" relates to sound settings or hardware functionality, which is independent of the internet connection itself. Thus, the chosen message is the most relevant for identifying network connectivity problems.