TeamViewer Unknown Session Error : TeamViewer is a popular software that allows you to remotely access and control another computer or device. However, sometimes you may encounter an error message that says “Unable to connect – Reason unknown” or “Unknown session” when you try to connect to a partner device. This can be frustrating and prevent you from completing your tasks. In this article, we will explain what causes this error and how to fix it.
What Causes TeamViewer Unknown Session Error?
There are several possible reasons why you may get this error when using TeamViewer. Some of the most common ones are:
- You are using an outdated version of TeamViewer on either your device or the partner device. TeamViewer updates frequently to fix bugs and improve performance, so you should always use the latest version available.
- You are not signed in to your TeamViewer account on the device that is initiating the connection. You need to sign in with your account to start a remote session, otherwise, you will only be able to join the session waiting room.
- You have not been given full access to the partner device to accept incoming remote control sessions. You need to go to the settings of the partner device and enable full access for incoming LAN connections.
- You have a firewall, antivirus, or VPN software that is blocking the connection. You need to check the settings of these programs and make sure they are not interfering with TeamViewer.
- You have a poor or unstable internet connection on either your device or the partner’s device. You need to ensure that both devices have a reliable and fast internet connection.
How to Fix TeamViewer Unknown Session Error?
Depending on the cause of the error, there are different solutions that you can try to fix. Here are some of the most effective ones:
- Update TeamViewer on both devices. You can check for updates by going to the menu and selecting “Check for new version”. You can also download the latest version from the official website.
- Sign in to your TeamViewer account on the device that is starting the connection. You can sign in by clicking on the profile icon in the top right corner and entering your email and password.
- Enable full access for incoming LAN connections on the partner device. You can do this by going to Options > Advanced > Network settings and selecting “Accept” for incoming LAN connections.
- Disable or configure your firewall, antivirus, or VPN software to allow TeamViewer. You can check the documentation of these programs for instructions on how to do this. Alternatively, you can temporarily disable them while using TeamViewer.
- Improve your internet connection on both devices. You can do this by moving closer to the router, using a wired connection instead of Wi-Fi, or switching to a different network.
Conclusion
TeamViewer is a useful tool that can help you remotely access and control another device. However, sometimes you may encounter an unknown session error that prevents you from connecting. This error can be caused by various factors, such as outdated software, account issues, access settings, network interference, or internet problems. To fix this error, you can try updating TeamViewer, signing in to your account, enabling full access, disabling or configuring your firewall, antivirus, or VPN software, or improving your internet connection. We hope this article has helped you resolve the TeamViewer unknown session error and enjoy a smooth remote session.