It is disclosed a MPTCP capable system for reducing disconnection time for a MPTCP capable UE (702), when it is leaving a coverage area of a second radio access type, when the second RAT typically has priority over the first RAT. This disclosure further comprises a controller of the second RAT (706), a MPTCP capable network proxy node(708), as well as a MPTCP network system therefore. In addition, methods and computer program in the respective arrangement are also presented.