If you are looking for software that can help you remotely control other machines, share your desktop with another user, transfer files or chat with the user at the same time, you can consider using TeamViewer. It is one of the most popular remote control and desktop sharing software and also allows you to host online meetings, participate in web conferences and more.
While the software is known for its features and easy-to-use approach, it can also get you into trouble at times. For example, many users see this error message "TeamViewer protocol negotiation error“While accessing the software. However, this problem can be solved. Let's see how.
Method 1: disable the firewall
Step 1: Go to Home at the desk and type Control Panel in the search field. Click on the result.
Step 2: A Control Panel house boy Firewall in the search bar. Now click Windows Defender Firewall.
Step 3: Click on Enable the Windows Defender firewall on the left.
Step 4: A Customize your settings click the radio button next to Disable Windows Defender Firewall under both Configure the private network Y Public network configuration.
* Note - You can also temporarily disable any third-party antivirus software running on your system.
Now you can easily open TeamViewer, but if you still see the error, you can try the second method.
Method 2: disable IPv6
Step 1: press the Tasto Windows + R together on the keyboard to open the file run I send. Now Write ncpa.cpl in the search field and press Log in.
Step 2: Right-click on the active connection and click Property.
Step 3: A Property dialog box below the file Networking tab, go to This connection uses the following elements section. Finds Internet Protocol Version 6 (TCP / IPv6) from the list and uncheck the box next to it.
print ok to save changes and exit.
That is. Your problem should now be solved and you can now open TeamViewer without errors.