Unable to join multicast group

Hi all! I have the following problem: at start of Unity I get two errors:

  1. Socket: unable to join multicast group, error: Operation has failed with error 0x2726: An invalid argument was supplied.(0)
  2. Unable to join player connection multicast group.

What is it? I haven’t changed anything in the Unity or system configuration, and it arises even when I launch the program with an empty project. Many people have this problem, but I can’t find the solution.

Although it does not hinder the project to work, it possibly may be dangerous.

Well i had the same error(s). Restarting the computer didn’t solve it either… But then i sign in with my unity account and now everything works fine… I’m using unity 5.3.4f1