It might show addresses and data which is completely wrong and we suggest you delete its entry. It’s highly likely that the TeamViewer entry in the ‘hosts’ file on your computer has been corrupted. Solution 1: Remove TeamViewer from the Hosts File

Reverting to the old interface managed to resolve the problem for them.

TeamViewer’s new interface – The user interface is not something which should be related to connectivity problems but it was certainly the case for several TeamViewer users.

It won’t hurt and it may bring TeamViewer back!

IPv6 connectivity – TeamViewer simply won’t work on IPv6 sometimes so make sure you consider disabling it for the sake of resolving this problem.For many users, this is all it took to resolve the problem so make sure you try it out! DNS and Winsock issues – DNS addresses can be changed and Winsock can be reset.Antivirus or firewall issues – If TeamViewer’s access to the Internet is prevented by the firewall or antivirus you have running, make sure you try making an exception for its main executable file.Deleting its entry will cause Windows to re-create it so try that to resolve the problem. Wrong settings in the ‘hosts’ file – The ‘hosts’ file contains important information about apps connecting to the Internet and it’s possible that the entry for TeamViewer got corrupted.

Teamviewer support link