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If you see the error "Protocol negotiation failed" in TeamViewer, we have compiled some fixes below.
According to the TeamViewer (TV) support community, this error occurs when connecting to a remote or other server or host using TeamViewer.
If there is a connection obstacle, you will receive a protocol negotiation error message. Try again."
According to TeamViewer, the reason for this error is said to be that it received the incoming connection on the TeamViewer host, but the actual remote control session was interrupted and thus not established.
There are many reasons that can cause TeamViewer protocol negotiation to fail. To fix the issue so that the remote control can successfully connect via TeamViewer, try the following solution.
To fix the issue so that the remote control can successfully connect via TeamViewer, try the following solution:
- Restart TeamViewer by closing the TeamViewer application on the host and then restart it.
- Restart the TeamViewer service in Control Panel services, essentially for TeamViewer.
that is configured to start with Windows and/or has unattended access. - Turn off your firewall, including Windows Firewall or a third-party firewall.
- Disable IPS (Intrusion Prevention System).
- Disable virus protection or exclude the TeamViewer executable or folder from scanning.
- Uninstall and reinstall TeamViewer.
router reset
Try to reset your router.
- Turn off your router and unplug it from the power source for about 10-20 seconds.
- Press any button on the router to dissipate any remaining power.
- Afterwards, reconnect the router to the power source and turn it on.
- When the router is ready, try TeamViewer again.
Disable Windows Firewall
As previously mentioned, the problem may be due to the functionality of the Windows firewall. In this circumstance, you need to temporarily disable the Windows firewall to see if the connection is successful. Here's how to do it:
- Press the Windows button to open the Start menu.
- Open Control Panel, then go to System and Security > Windows Defender Firewall.
- Click 'Enable or disable Windows Defender Firewall' on the left side.
- In the public and private network settings, select 'Turn off Windows Defender Firewall'.
- Click OK, then try connecting.
Update TeamViewer
If the above solutions don't work for you, it may result in a version conflict between your system and the target system. This way you make sure that the software is running on the latest version and no updates are required for installation.
https://community.teamviewer.com/t5/General-Questions/Protocol-negotiation-failed/td-p/24721
RECOMMENDED: Click here to fix Windows errors and get the most out of your system performance
