question: protected void tearDown ( ) throws Exception { stunStack . removeSocket ( clientAddress ) ; stunStack . removeSocket ( serverAddress ) ; clientSock . close ( ) ; serverSock . close ( ) ; requestCollector = null ; responseCollector = null ; System . setProperty ( StackProperties . PROPAGATE_RECEIVED_RETRANSMISSIONS , "false" ) ; System . setProperty ( StackProperties . KEEP_CRANS_AFTER_A_RESPONSE , "false" ) ; System . setProperty ( StackProperties . MAX_CTRAN_RETRANSMISSIONS , "" ) ; System . setProperty ( StackProperties . MAX_CTRAN_RETRANS_TIMER , "" ) ; System . setProperty ( StackProperties . FIRST_CTRAN_RETRANS_AFTER , "" ) ; super . tearDown ( ) ; }
target:  Frees all sockets that we are currently using.