The openflow status change to disconnected while the link is ok

1)Connect switch to 5 nodes

2)The link between switch(1.1.1.1) to controller is ok,but the openflow status is disconnected( No Role: Unknown Negotiated Protocol Version: disconnected).

3)In opendaylight.log,switch(1.1.1.1) try to set up openflow channel but failed. There is an info message:
o.o.o.i.c.l.HandshakeListenerImpl - ConnectionContext initial processing failed: Role context for master Node {} is still not closed. TxEntity was not unregistered yet. [Uri[_value=openflow:506079591508167]].

4）For more details please refer to the attached opendaylight.log.