Minecraft won't let me join servers

When I attempt to join a server it won't let me.
Minecraft said: Failed to connect with the server. Not authenticated with minecraft.net

What I expected to happen was...:
I expected to join my favorite multiplayer server.

What actually happened was...:
Minecraft told me on the screen: Failed to connect with the server. Not authenticated with minecraft.net

Steps to Reproduce:
1. Join a server in 1.11.2 (I joined Hypixel)
2. See what happens.
3. ...