Reason Unknown

Modified on Fri, 28 Mar at 11:08 AM

Error message: Reason Unknown 


  • Error message: Reason Unknown

    Last Modified: Jun 22, 2023

TeamViewer recommends that all users download and start using the latest version of TeamViewer on all supported operating system platforms.

When you see a pop-up offering you to Update Now, please check the version of the TeamViewer (Classic) software you are currently using, and immediately update to the latest version of TeamViewer.

This article applies to all TeamViewer (Classic) users who have not upgraded the TeamViewer (Classic) software to the latest version and see the error message: "Unable to connect - Reason unknown".

Check TeamViewer (Classic) version

  • Windows: TeamViewer (Classic) ➜ Help ➜ About TeamViewer ➜ Version
  • macOS: TeamViewer (Classic) ➜ About TeamViewer ➜ Version
  • Linux: TeamViewer (Classic) ➜ Help ➜ About TeamViewer ➜ Version
  • Android: TeamViewer (Classic) ➜ Settings ➜ Version
  • iOS: TeamViewer (Classic) ➜ Settings ➜ Advanced Settings ➜ Version Information

At the same time, please check the compatibility of operating systems and software versions: Supported operating systems.

Solution

When you see the error messages in TeamViewer (Classic) with Reason Unknown, and the connection cannot be established, please download and update TeamViewer to the latest version.

Windows, Linux and macOS

When the TeamViewer (Classic) software pops up with an error: Unable to connect - Reason unknown, please update TeamViewer to the latest available version.

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Mobile devices - Android and iOS

When the TeamViewer remote control app shows the following error:

Android: Could not connect to partner

image.png

iOS: Unable to connect - A connection could not be established. Reason unknown

image.png

Please update the TeamViewer remote control app to the latest version via your app store.

  • AndroidDownload the latest version of the TeamViewer remote control
  • iOSDownload the latest version of the TeamViewer remote control

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