teamviewer not accepting incoming connections

When connecting from another computer to NixOS 18.09 with Teamviewer with no users being logged in already on the NixOS box (just the sddm login prompt screen showing), the connection does complete and the login screen can be observed remotely, but nothing can be typed into the login box to login remotely. During the 'Connecting message' or spinning activity icon from the box trying to make the inbound connection to the NixOS system, the logfiles of Teamview 13 on NixOS don't show anything of particular interest. When connecting from another computer to NixOS 18.09 with Teamviewer with the user being logged in already on the NixOS box, the connection doesn't error out, but just shows an on-going 'Connecting message' or spinning activity icon without ever showing anything else or completing the connection.

Only incoming connections to NixOS are a problem. nixpkgs: /home/user/.nix-defexpr/channels/nixpkgsĬonnections from NixOS to other Teamviewer computers works as expected.Please run nix-shell -p nix-info -run 'nix-info -m' and paste the

Teamviewer not accepting incoming connections