I am configured two servers(A, B), A is live server, B is backup server

when I down live server A , I got following exceotion but backup server B is working fine

Jul 19, 2011 11:50:35 AM org.hornetq.core.logging.impl.JULLogDelegate warn

WARNING: Tried 1 times to connect. Now giving up.

org.springframework.jms.UncategorizedJmsException: Uncategorized exception occured during JMS processing; nested exception is javax.jms.JMSException: Failed to create session factory; nested exception is HornetQException[errorCode=2 message=Cannot connect to server(s). Tried with all available servers.]

    at org.springframework.jms.support.JmsUtils.convertJmsAccessException(JmsUtils.java:316)

    at org.springframework.jms.support.JmsAccessor.convertJmsAccessException(JmsAccessor.java:168)

    at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:469)

    at org.springframework.jms.core.JmsTemplate.send(JmsTemplate.java:543)

    at com.advertise.benchmark.protocol.JMSSender.executeRequest(JMSSender.java:46)

    at com.advertise.benchmark.components.searchtracking.AdsSearchMessageExecutor.run(AdsSearchMessageExecutor.java:69)

    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

    at java.lang.Thread.run(Unknown Source)

Caused by: javax.jms.JMSException: Failed to create session factory

    at org.hornetq.jms.client.HornetQConnectionFactory.createConnectionInternal(HornetQConnectionFactory.java:605)

    at org.hornetq.jms.client.HornetQConnectionFactory.createConnection(HornetQConnectionFactory.java:119)

    at org.hornetq.jms.client.HornetQConnectionFactory.createConnection(HornetQConnectionFactory.java:114)

    at org.springframework.jms.connection.SingleConnectionFactory.doCreateConnection(SingleConnectionFactory.java:342)

    at org.springframework.jms.connection.SingleConnectionFactory.initConnection(SingleConnectionFactory.java:288)

    at org.springframework.jms.connection.SingleConnectionFactory.createConnection(SingleConnectionFactory.java:225)

    at org.springframework.jms.support.JmsAccessor.createConnection(JmsAccessor.java:184)

    at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:456)

    ... 6 more

Caused by: HornetQException[errorCode=2 message=Cannot connect to server(s). Tried with all available servers.]

    at org.hornetq.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:619)

    at org.hornetq.jms.client.HornetQConnectionFactory.createConnectionInternal(HornetQConnectionFactory.java:601)

    ... 13 more