Thank you for responding. Unfortunately, your advice didn't work for me, teamviewer still failed to connect even with [int32] AllowedConnectionProtocols = 3 However, I have today upgraded my Ubuntu release from 17.04 to 17.10, and teamviewer is now working again, even without the AllowedConnectionProtocols setting. I have to assume that there was some quirk in my DNS settings which conflicted with TeamViewer, but the upgrade to 17.10 has fixed this. Thank you for your help anyway.
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