Provided are a connection method, a configuration updating method, a control plane device and a user plane device. The method includes: transmitting, by a control plane device, a first request message for establishing a connection to a user plane device, where the first request message for establishing the connection includes information about the control plane device; and transmitting, by the user plane device, a first response message indicating that the connection is successfully established or a first response message indicating that the connection fails to be established to the control plane device, where the first response message indicating that the connection is successfully established includes information about the user plane device, and the first response message indicating that the connection fails to be established includes the information about the user plane device and a reason why the connection fails to be established. Further provided is a storage medium.