When remote network resources are inaccessible, the most common reason is that the necessary secure connection has not been set up or is experiencing issues. Ensuring that the service allowing secure remote access is correctly configured on the user's device is the first step in troubleshooting. Other concerns such as app updates or permission settings, while valid, are secondary to establishing a secure connection for accessing the private network remotely. Incorrect answers, though closely related, do not address the initial step in resolving secure connection setup for network access.