LoadUI 2.1.2 distributed mode hangs

Here is the stack trace from the agent when the controller hung. All agents have the same stack and the controller didn't respond.

19:17:19,720 DEBUG [SoapUIMultiThreadedHttpConnectionManager$SoapUIDefaultClientConnection] Receiving response: HTTP/1.1
200 OK
19:17:19,720 DEBUG [HttpClientSupport$SoapUIHttpClient] Connection can be kept alive for 15000 MILLISECONDS
19:17:20,001 ERROR [ServerSocketMessageEndpoint] Connection closed:
java.net.SocketException: Software caused connection abort: recv failed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at sun.security.ssl.InputRecord.readFully(Unknown Source)
at sun.security.ssl.InputRecord.read(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
at sun.security.ssl.AppInputStream.read(Unknown Source)
at sun.security.ssl.AppInputStream.read(Unknown Source)
at java.io.ObjectInputStream$PeekInputStream.peek(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.refill(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.read(Unknown Source)
at java.io.DataInputStream.readUnsignedShort(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readUnsignedShort(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readUTF(Unknown Source)
at java.io.ObjectInputStream.readUTF(Unknown Source)
at com.eviware.loadui.impl.messaging.socket.ServerSocketMessageEndpoint$MessageReceiver.run(ServerSocketMessageE
ndpoint.java:149)
at java.lang.Thread.run(Unknown Source)
19:17:20,001 DEBUG [ServerSocketMessageEndpoint] Connection closed:
19:17:20,001 INFO [ControllerImpl] Stopping scenario: vu_v15_send
19:17:20,001 DEBUG [ModelItemImpl] Triggering action 'STOP' on ModelItem 'ComponentItemImpl[label=Fixed Rate]'
19:17:20,001 INFO [ControllerImpl] Stopping scenario: vu_v15_send
19:17:20,001 INFO [ControllerImpl] Client disconnected
19:17:20,001 DEBUG [TestRunner] Starting phase: PRE_STOP
...