For the most part, TeamViewer is able to make connections without any special configuration of a device. However, it is possible that your TeamViewer (Classic) may indicate a red light and the message Not ready. Please check your connection.
This article applies to all TeamViewer (Classic) users.
Here are a few things you can check if you experience this alert:
📄 Ports used by TeamViewer - TeamViewer Support
General This article applies to all users in all licenses. TeamViewer is designed to connect easily to remote computers without any special firewall configurations being necessary. In the vast majority of cases, TeamViewer will always work if surfing on the internet is possible. TeamViewer makes outbound connections to the…
Welcome to TeamViewer's home for real-time and historical data on system performance.