For me, on OS X, it was caused by being connected to a VPN. This error should only occur with fastrtps as the RMW implementation. It's being tracked upstream at https://github.com/eProsima/Fast-RTPS/issues/77 --- [Visit Topic](https://discourse.ros.org/t/ros2-beta2-on-mac-crashes-with-address-already-in-use/2234/4) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: