How to accept incoming network connections in OS X 10.11 El Capitan? After logging in the following message appears:

Do you want the application “Microsoft Word.app” to accept incoming network connections?

How do I allow Word to accept incoming network connections in El Capitan?
Because of your builtin OS X firewall.

Go to System preferences -> Security -> Firewall and add "Word.app" in the "Firewall options" as exception.