For the first one find this
This is how it look like in my computer. Find the one called Ethernet. Right click with the mouse on that and Disable and the Enable again. On the right hand side of the screen it will probably ask you about visibility on the LAN.
2.If it says Private Network it is fine
If not go to
Double click on the icon on the upper rightr
Make sure this is On
This would probably do it.
If not reinstall the program.