Team Viewer 14 on Windows 10 & Mint 19 on LAN no connection reason unknown

teamviewer 14 on mint 19 could not establish connection to windows 10 with teamviewer 14 on LAN because of reasons unknown. Again TV lets me down on linux mint with updates that dont work. Dont you test this before throwing your warez online? your upgrades should help me and not break my workflow and control again. Please help, this is essential for my workflow.