18.2.9.2. Prerequisite 
The same protocol (TCP or TLS) must be used for the connection
to the gateway for the VISITED and HOME station
in order to avoid that a VISITED station using TCP can disconnect a HOME
station using TLS (Dos attacks).
A HOME station connected via TCP that is disconnected by a VISITED
station connected via TLS is unable to disconnect the VISTED station
and therefore cannot reconnect to its gateway again.