hibernate configuration for sql server

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Java

Hello everybody, i have a problem with hibernate configuration with sql server. I don't know what is exactly the connection string is? So below is my "hibernate.cfg.xml". Please take a look at it and give me some solutions

<session-factory name="HelloHibernate">
  <property name="hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
  <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
  <property name="hibernate.connection.url">
  jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=dbhellohibernate;username=sa;password=admin
  </property>  
  <!-- Mapping file -->
 	<mapping resource="nguyenle/hello/Message.hbm.xml"/>
 </session-factory>

But when run the test program i have this error: some of them are "could not open a connection"

Please help me, because i'm just a novice with hibernate