When the connection is being interrupted by a background process, TeamViewer is not able to establish a connection with the targeted user successfully due to which it throws the error message. Nonetheless, we will be showing you how to solve the issue in this article.
What causes the TeamViewer Protocol Negotiation Failed Error Message?
Since the error message pops up while trying to connect to another TeamViewer user, this can due to the following reasons: Now that you are aware of the possible causes of the error message, let us get into the solutions and get your issue sorted out. We advise you to go through all the solutions as they are scenario dependent.
Solution 1: Disable Windows Firewall
As we mentioned, the issue can be due to the Firewall functionality of Windows. In such a case, you will have to temporarily disable Windows Firewall to see if the connection is successful. Here’s how to do it:
Solution 2: Disable Third-Party Antivirus
Modern antivirus software now comes with features that help you protect your internet activity and keeps away all the skeptical things. However, in some cases, these features also tend to be troublesome as they block something that they are not supposed to. Therefore, disable the third-party antivirus software that you are using and then try connecting using TeamViewer. If it works, this means that your antivirus is the culprit. In such a case, what you can do is add an exception in your antivirus software and you should be good to go.
Solution 3: Scan your PC
If your system is infected with virus and malware, you won’t be able to make a connection. In such a case, you will have to install antivirus software and scan your PC thoroughly so that it can clean your system up. You can also run the Windows Defender to search for malware. Here’s how to do it in Windows 10:
Solution 4: Update TeamViewer
Finally, if the above solutions do not work out for you, then there might be a version conflict between your and the target system. Therefore, make sure the software is running the latest version and there are no updates required to install.
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